C) is definitely the main deal breaker without question.
Yeah, I was feeling that!
Despite that, I wonder: how long would it take to make that battery to be unusable?
I mean, if that was the only light we had, being used every day!
I own several built-in rechargeable lights and by the way I use them, they will last me ages (unless they break).
Despite this, I would also prefer 2 replaceable batteries, it would be more versatile.
Just now seeing these models… I kinda feel like I’m some sort of trend setter. Maybe I made a decent prototype for them to follow? 
Yours is even better, as it is wireless charging