To be honest, some may be to an extent but I’ve heard of issues. The last one, I don’t see how it can be address “add more parts needed, like seals, screws that strip too easily, that annoying sticky tape etc.”. Because they may take extra steps to ensure durability and integrity (mainly to just make more $$ from those doing it themselves.).
I also find it odd because for me at least in the US, it cost me less than $100 for a iPhone 13 Pro Max battery replacement after a little more than 1yr of use, primarily went out due to extreme cold weather. Is the problem more towards a lack of authorized repair locations or their pricing? I’m sincerely curious what is the root issue here.