Phones are getting more expensive so people are holding on to them longer, so it's a nice quality of life improvement to remove the barriers to battery replacement so less people have to go down to a phone repair store to get it changed. The more of a hassle battery replacement is seen the more likely people are to just upgrade and create e-waste.
The problem here is that in order for most people to be able to replace the battery themselves safely they need to be really idiot proof.
We’d need to return to back covers with latches or big screws and batteries in cases and contacts. This shit is bulky, heavy and hardly waterproof.
New iPhones use lipo pouch with a ZIF connector straight to the motherboard with a “pull to release” adhesive strip hidden under a panel with a single use sticky seal and two small screws. There is no black magic in replacing the battery yourself and the solution is small, lightweight and waterproof.
However most people wouldn’t even know which way to turn the screws to loosen them and probably wouldn’t be bothered by throwing the phone away and getting the one with a better camera AI and more emojis.
[edit: deleted, echo chamber here. Android good, Apple bad. Moving on and blocking this community, can't have a reasonable conversation, just like reddit I guess].
The difference is that most of the people isn't expected to own a mechanical watch, but having a smartphone is pretty much expected. You cannot treat a basic commodity as if it were a luxury item.