Regarding the recent discussion I think you are missing something: Can't some people have issues and be unlucky, and some other people have no issues? It has certainly happened in the past. Everyone does not have the same experience.
Also, some people may be less tolerant of even the slightest decrease in performance/slightest lag appearing - that wasn't present before - so they are unhappy, and they complain. It isn't wrong. As it isn't wrong to be perfectly happy with the update and the new features it introduces, even if - and I am not saying it unconditionally does - it introduces lag/slowdowns.
Both approaches are valid, and you don't have to attack the person who is unhappy, as you (you meaning every forum member) don't have to attack the person who is happy with the features and the update.
Debate enriches discussions, and differing opinions and experiences enrich them too.
I do not update because I am fearful of lags and issues, and I miss security updates and features, and it is a trade off I am willing to pay. And it is ok.
You do update because you are interested in security updates, features, and app compatibility. And it is ok too. We can only share experiences and opinions, but we shouldn't attack the one who has a different experience/opinion.