Generally agree with you. Don’t forget, though, there are more people who believe no speed limit sign applies to them than those who follow it.
The cops usually forgive 5mph or so. I had somebody zooming up on my tail and instinctively sped up about 5 mph thinking I was in a 35. I wasn’t - it was a 30 and I got nailed just over 40. Oops.
I used to do 35 in a 30 around here years ago. Big wide road, etc. Then I got a ticket on it for 35. Now I go 32 on it. Just enough over to not feel guilty about the guy on my butt - although when I make my left turn I have to make sure I start it as soon as the turn lane starts or every once in awhile they try to get into it first! (Had one guy pass me on the road. Of course I pulled right in on his bumper at the next light!)
They also have some new, wide bike lanes. Lots of times folks treat them like right turn lanes, so I have to watch out for them too, when I’m turning right from the driving lane.
I still haven’t learned my lesson on the freeway, 10 to 15 mph over depending.