No, I use chatGPT for everything anyway. I’m still getting a new iPhone
Yes, charging that fast will cause faster degradation than slow charging, though more impactful is probably whether you charge to 100% or not. I use a 12W charger max, the one from my iPad mini, but try to use a 5W when I can. My 14 Plus battery is still at 100% capacity, not sure of the cycle count though
The Apple ones are usually hard plastic, which are slower to yellow, but I still prefer TPU cases that I can get for <$10 on Amazon, because I like how they feel more. They also have less potential to scratch your phone with trapped debris and stuff, in my experience