Different strokes for different folks I guess. I happen to like my removable battery. It's seriously convenient! My phone is getting to three years old now, and because of the distributed load on my 2 batteries, its kicking about as hard as the day I bought it. As the removable battery crowd likes to point out, I can go from zero to 100% battery in 5 seconds! All without the high voltage/amperage charger, a power outlet and 30ish minutes needed by quick charge!
Sure, it means more often than not that my phone will be fatter than newer style phones but its also more robust than quite a few of its anorexic brethren. Dust and water resistance come from a well thought out design and strategically placed gaskets. Should I ever need to make a repair, getting in there will be half done in 2 seconds. A heat gun and a suction cup will be a last resort, not a first. Skins and cases are not as necessary, a new cover can be had for a few bucks, and shifting the internals, while tricky, can be done by the likes of me.
With all that said, I won't say you are wrong for moving on. For your scenario, non removable batteries make sense, just as user replaceable ones make sense for me. Even now as I contemplate an upgrade to something with modern capabilities and the processing power and memory I now sorely lack, a removable battery is still kinda high on my checklist, as it is for a lot of others.