I have an iPhone se and it’s actually shut down once due to the battery and turned on the performance capping. Honestly I haven’t noticed a significant difference. But that’s trivia, my main point is next.

Batteries are consumable products. That they degrade over use is a given.

No phone company states the expected useful life of their batteries in a way people can understand or the expected loss of performance due to degradation.

I don’t fault Apple for this alone. Apple seems no worse than anyone else. The entire industry is shady when it comes to batteries.