A couple of days ago I went for a walk in the park with the kids, and they wanted cameras for themselves (the desire only lasted for half of the walk but that's a different story).
So for one of them I got the E-M5ii with a zoom. Minutes into the walk he complains that something is wrong with the camera, and I figured it out he was accidentally switching to manual focus. Which button was that? Good luck, I didn't recall so I dived in the menus and changed it there. A minute later, same thing. So I had to figure it out which button was the culprit but good luck doing that with the moderate thickness gloves, I had to take them off. Eventually I figured it out it was the button next to the lens mount which was getting pressed accidentally and after a little instruction things were better. But this brings me to an older complaint, if I have difficulties operating the E-M5ii with gloves, how can I do it with the E-M5iii which is even smaller?
I was able to operate a Z7 (with a little effort for the next to mount buttons) and a X-T2 (no issues) with the same gloves.
Not to mention that it requires constant and frequent use to recall all the options, you can't just pick the camera after a couple of months and use it without issues; if the m43 is your only system that's probably not a problem, but I still alternate between multiple systems and currently the m43 gets used the least.