I wonder what is the definition of easily removable and replaceable. Does popping a few screws and using a specialized tool qualifies as easy? What about re-sealing the device after to keep the waterproof rating?
Is waterproof even a real needed feature? Like, I've been owning mobile phones for 22 years at this point and it's literally something I've never cared or benefitted from. On the other hand, having replaceable batteries is definitely something that's been useful in the past.
I use my cell phone in the rain, I use my cell phone in the shower. I drop it in the mud and rinse it off in the sink.
Waterproof is a top-tier feature, right up there with "not exploding the screen into a thousand shards when I drop it".