Of course there is a strong second hand market, the iphone cost too much for a lot of people to buy it new.
I notice that you ignore every single arguments that you dislike. You admit yourself that replacing the battery is too hard for a regular person and must pay a repair shop to do it.
Sadly they can't replace the battery without the iPhone showing 'not genuine apple battery'. https://www.youtube.com/watch?v=NwRYcEI-wx8 Apple admit themself that their iPhone are made to last 3 years : https://www.mirror.co.uk/tech/apple-reveals-iphone-lifespan-...
Of course there is a strong second hand market, the iphone cost too much for a lot of people to buy it new.
I notice that you ignore every single arguments that you dislike. You admit yourself that replacing the battery is too hard for a regular person and must pay a repair shop to do it.