1. The things I'm talking about are there in the 10+ iOS 9 phones that I've personally used. I've never held a single iOS 9 phone in my hand that had the same smoothness as iOS 8. I can also see lag in the supposed "smooth" iOS 9 videos posted on MR.The things you are talking about aren't there for most people. And, yes, look at what iOS 7.0 or 8.0 were like during beta and when they were released and compare them to their final versions. iOS 8.0 wasn't smoother even 1x compared to iOS 9 and had even more stability and performance issues in general, to imply otherwise is to ignore reality and many more complaints from practically endless 8.0 threads (same goes for 7.0).
2. iOS 7 had smoothness issues only on the iPhone 4 (which had very outdated hardware at the time, which the 5s and 6 do not have).
3. iOS 8 didn't have smoothness issues. It had stability issues and had a lot of bugs, but it was super smooth from day 1.
I don't think anything less of you just because you're one of those people who can't see the difference between 60fps and 30fps, but that doesn't mean other people can't see the difference either.