Imo I don’t think the goal is/should be “every part is repairable by any average person without tools” tbh. Like that would be awesome but it also isn’t realistic, like you said phones are super complicated. But making simple repairs – stuff like swapping a battery – possible for anybody is realistic imo, and then the rest should be as easy to repair as possible for local shops or someone who does have the necessary skills and equipment. At least personally I feel like that’s a good spot to aim for.