On my 5 year old iPhone SE, I've had the battery replaced twice and the power button replaced by a third party. The Apple-partnered shop actually said they are

On my 5 year old iPhone SE, I've had the battery replaced twice and the power button replaced by a third party. The Apple-partnered shop actually said they are unable to replace the power button and referred me to the third party, who were surprisingly great (fast + guaranteed that if they wouldn't be able to fix it, I'd only pay a small diagnostic fee). I'm sure by Apple's standards I should have already bought a new phone. I expect to get similar repairs done on my next phone.