I have never used a phone without easily replaceable battery (where "easily" means no screwdriver necessary, just pop the backcover and pull the battery out). It just happened this way, but I think I'd refuse to buy one anyway, as aside of obvious repairability and maintainability issues having the battery sealed in is also a big factor that makes dropping the phone so dangerous. When I drop my phone, the battery is easily set free to disperse its kinetic energy away from more fragile parts of the device, so it's much harder to break the phone this way. I have made some small dents and scratches from drops over the years, but no serious damage.