I use couple of devices that are nearing end of support - iPhone XS, 1st gen Apple TV 4k (which is iPhone 7 essentially) and they perform admirably well. iOS 16 was pretty bad at times but it was mostly resolved with iOS 17.
Read the whole story. They’re not slowing your phone down because it’s old, nor are they doing it deliberately. It’s to keep your phone working if your battery is worn out.
I swear, people never let the facts get in the way of a good hate-jerk about Apple.
You realize you're going from saying "it's not deliberate and it's not because they're old devices" to saying "they do it intentionally if your battery is worn out (implying that it's old)"