No, they're not. They have a few minor problems that some users experience in the first roll out. They are ironed out within a couple weeks with point releases. No body, not even Apple, can find every minor bug on the first release. There are too many combinations of software/hardware interactions that people use for beta testers to try. All in all, they are usually pretty rock-solid for the majority of users. There is nothing that comes out that is a "disaster" as you put it. You are posting FUD, unadulterated FUD.
Frankly, I doubt you really own an iPhone. You are not one of the 750 plus members of the Apple Ping List. . . that tells me a lot. Trolls who post FUD usually try to give themselves some authority by claiming ownership of an Apple device. . . but your unmitigated claims of 'disaster" on updates when they don't happen the way you claim really is false.
Is this similar to someone calling Rush Limbaugh, and saying, Rush, I am a registered Republican, but......... You know those seminar callers are lying out of their you know whats. 😀😆😄
You...doubt it? Who enshrined you as the arbiter of truth and Apple ownership? What you believe or don't believe is of no concern to me but to mock your spittle-flecked button-mashing in a public venue here's a photo of my phone:

Incredibly enough, the photo was taken by my iPad and vice versa:

I realize this invalidates your haughty claim of denial but them's the breaks.
You are not one of the 750 plus members of the Apple Ping List. . . that tells me a lot.
It tells you nothing except what the voices in your head say. It's a desperate attempt to invalidate criticism because you have a strange, bordering on irrational, obsession with a company's products. And we thought Rush Limbaugh was hooked! And how and why is the Apple Ping List relevant? It's a voluntary list. It's optional. It's a mere 750 members on a site with hundreds of thousands of users, tens of thousands of whom probably also own Apple hardware.
No, they're not.
Yes, they are. This chart demonstrates the following:
1) A massive amount of searches related to degraded performance and response in a short amount of time.
2) A rapid subsidence of those searches as bug fixes are issued
It is safe to assume that not every user obtains the newest hardware. In fact, it's safe to assume that most of them do not for reasons of finance, inconvenience, or the fact that they just bought a new phone a year ago. Therefore, the searches and the problems are related to new iOS on existing hardware.
They have a few minor problems that some users experience in the first roll out.
A statement for which you have provided no empirical evidence ie the kind you demand from others. A 'few minor problems' would not elicit a panicked x.01 update within 24 hours of release, to say nothing of x.02, x.03 issued in under a week. iOS 11 is the most recent example.
They are ironed out within a couple weeks with point releases.
I hate to have keep explaining your position as well as mine, but this statement invalidates your previous one. There are either bugs or there are not. Updates issued almost immediately after the first release in response to user complaints confirms that these are, indeed, bugs.
No body, not even Apple, can find every minor bug on the first release.
The point is they don't try very hard given their budget and manpower. Why is it an article of faith with you that they do? It's obvious that the Shiny New Object phenomenon is the main driver of behavior at Apple and among many in its user base. iOS 11 has produced widespread reports of an inability to type the capital letter 'I,' for example. It may be a minor annoyance and become the subject of a humorous meme but testing full keyboard/character functionality would seem to be the most basic of QA procedures.
There are too many combinations of software/hardware interactions that people use for beta testers to try.
Now THIS is unadulterated horseflop. Too many combinations? iOS is proprietary. It's owned by Apple. It runs only on Apple hardware (VM experiments notwithstanding). There have been only 11 versions of iOS issued. On the hardware side, there have been 10 or fewer full versions of the iPhone with variations within generations. There are, actually, a relatively LOW number of combinations of hardware and software which directly contradicts your statement.
And if you're speaking of apps, that is not the subject of the article or the initial response. Apps are the responsibility of the developers - but their even more frequent patches indicate they also are more concerned with rapid deployment than with stability.
All in all, they are usually pretty rock-solid for the majority of users.
And despite this subjective claim, the chart shows massive spikes in searches for help. Oh dear, how inconvenient.
There is nothing that comes out that is a "disaster" as you put it.
So your subjective claim trumps mine? Interesting criteria - and convenient also. But it's obviously a dramatic - and relative - term. You seem to want to exclude Apple from any and all responsibility for their product and procedures. They, not you or I, are the ones pushing iOS releases as technological revelations. They nag you on the device. They nag you in iTunes. If it's so wonderful and a must-have why are there so many problems, complaints and requests for help upon release?
You are posting FUD, unadulterated FUD.
Actually, it's not unadulterated. I added water per the label's instructions.
No, I'm afraid I'm writing about my experiences and those of many others. Again, the chart absolutely supports my position, which is why I posted in the thread in the first place.
I note that you have completely avoided the topic of Apple's response to bug reports. Posting in a 'User Community' is as futile as trying to fly by flapping one's arms yet it is Apple's most frequent response to reports of trouble.
Trolls who post FUD
Step 1: stick fingers in ears. Step 2: yell 'Troll!'
If you've got so much energy why not check post history? I've been here since 2004 and have discussed innumerable technological topics. You and I have, in fact, had productive and not-so-productive discussions on various subjects but regrettably you have lost the plot on this one, mostly because you are playing the man and not the ball.
usually try to give themselves some authority by claiming ownership of an Apple device
I'm making no claim whatsoever. Your inference is your own. My 'authority' is experience combined with ownership combined with a knowledge of and traffic in many Apple user forums (official and otherwise) in which - surprise! - widespread problems related to iOS bugs are a large portion of the discussion. Which brings us full circle.