I'd love a return to the old snap-fit plastic cases. Besides the ease of battery replacement, those phones seemed much more durable. Maybe because there was something that gave way on impact? I remember watching in horror as the plastic cover of an old LG shot under the display shelving at Home Depot at approximately the same speed the phone hit the concrete floor. I never used a case with one of those phones, nor did I ever crack a screen. It was tricky digging that cover out from under the shelving, however.
Similar thing with dust. Even though a lot of my phones in my teenage years lasted under a year, they always died with dust in their screens. Camping and riding bikes around dirt trails and what not can push a lot of gunk in those things.
I'm happy phones are a lot better sealed. It's a bit of a pain making it harder to swap the battery, but paying a shop $50 parts included to swap it and keep it sealed well is worth it to me. A replacement battery back then would have been like >$30 anyways, going by inflation that's not too much increase in cost.