I would prefer not to use Amazon or Costco because of their leadership's leftist orientation, but they both provide so much convenience and value that they are difficult for me not to use. The alternatives are typically not that much better from a political standpoint.
But what you have said sounds like it came from an alternative universe. I have used Amazon from the time when they were selling only books and have been a Prime member since 2005. In all that time I do not recall receiving 1 erroneous order. I have returned dozens of items over the years for free and without hassles because they were not what I expected, the didn't work or were broken, or they were not as described. But I would not describe what I received as "erronious". I have no idea how you could come up with your “30% error rate as of last month” statement. It is obvious nonsense.
I agree with you. Amazon is a company I hate doing business with but they do deliver stuff fast and cheap.
I think the other poster was referring to a 30% error rate on automated pick & pack processes, not human error. Though it does seem to be a bit too high. If it was only 70% effective it would have never been deployed.
Still, Elon Musk still assembles cars by hand. So the technology may be close but not there yet it seems. Or just cheaper and easier to scale human labor than it is to scale and test automation.