I use the Artist & Artisan half-case on my M10-M/R. I like its looks, feel, and fit better than any of the others I've tried (including Luigi's and Leica's). I only have one: I don't store the cameras in the half-case; I fit the half-case to whichever camera I'm going to use on a given outing. I don't use any case when working at home doing copy or tabletop work: It's just another thing to get in the way in that circumstance.
While the M10-M/R do not have USB ports, they are fully equipped with WiFi so I can move files from camera to iPad Pro/computer without taking the case off, if doing that should prove inconvenient. My usual outing/shooting session is about 30-60 exposures, a fully charged battery usually delivers about 500-700 exposures, a 128G SD card can store up to 1000 raw files, so I don't need to take the case off to change the battery but once every 8 to 10 shooting sessions. I deem that inconvenience so trivial as to be a non-issue ... it takes less than a second to remove the camera from the half-case, or put it back in.
You worry too much about trivialities. This is what comes of reading all the noise on the internet vs using/testing the equipment for yourself. 😉
G