Realistically similar type of complaints and threads were around in the early days of iOS 10 as well (and 9, 8, etc.), and then things improve for more and more who are experiencing or noticing issues by the time more and more updates come out for those versions so much that by the last update it's usually almost (if it actually) praised as an example of perfection even by many of those who were not happy about it in the initial versions.
Yep defend defend defend defend (Unsurprisingly).
Yeah thats all based on perception. People don't notice their phones have slowed down after a while. iOS 10 a) had far more iPhone features than iOS 11 and b) managed to run far better on old devices despite this.
Can you show me those devices which can render animations perfectly on iOS 11?