The benefits of having a somewhat slimmer phone with a sealed battery is minute next to the fact that the battery lifetime in practice decides the phone lifetime, thereby diminishing both 1st and 2nd hand value. Apart from all practical solutions it deprives you of, like having a 2nd charged battery ready in your pocket. The only benefits of locking in the battery, belongs to the manufacturer, while the consumer gets all the downsides. And there are many.

If you want a slimmer phone, buy one without all the extra hardware Nokia puts in. That'll unchub it good.