Having a removable battery was a requirement for me for the longest time. However, that time has come and gone and I am all about water resistance.
The Galaxy S6E+ was the first sealed battery phone that I owned. Since that time, I have bought several wireless chargers. I have one on my desk at work, and 3 at home (nightstand, kitchen counter, and end table next to the couch). So, pretty much every time I set my phone down, its charging. I have a charging cradle in my truck as well. If I will be away for a long period of time, I purchased the Samsung quick charger that I carry around. Its so slim and light you don't even realize you're carrying it. I don't worry about wearing down the batteries over time, because I don't have my phones long. Since the S6 Edge+, I've had the Note 5, S7 Edge, and I have a Note 7 on preorder.
Water resistance on the other hand, for me, is awesome. There is something I find really fun about being able to take my phone in the pool and take pictures of my kids, family, friends, etc. (I live in AZ, so we live in the pool lol). First time with my S7 Edge, I even took a couple of underwater videos. Love being able to do this and do not miss removable batteries the least bit.