At one point I was considering the M6 as an emergency backup for my 5D IV, but in the end it didn't make sense (The R is a much better fit for my needs once all was considered). I liked the M6 because it had relatively good quality in a small form factor. I was most concerned about size and weight, and I almost never use the viewfinder (most of the images I take are on a tripod and in live view) so I wouldn't have missed it. In fact, the lack of a viewfinder was attractive to me because it cut back the size and squared off the whole unit.Why the M6 over the M5? Wouldn't having a real viewfinder be preferred for most situations? I can't see squat when outside in the daytime.
Just curios as to the appeal for a finderless camera.
PS don't give me crap you can get a finder for the M6 as that comes with the M5 at no extra cost or effort and keeps the accessory shoe free for other things like a flash.
Right now I take most of my favourite images on multi-day camping trips where I need to carry everything in, and won't have any chance to recharge batteries. The purpose of considering an M6 was if the 5D IV fails or breaks, at least I will still have a sensor which can be adapted to my EF lenses and can still take images of sufficient quality without breaking the bank (though with some clear limitations) and won't relatively add a lot of weight or take up a lot of space in a bag. As an example, I'll be doing a 7 day back country hiking trip this September, with no chance of charging my gear over that period, and everything will be carried over ~60k with lots of elevation change, in addition to food and camping gear. Having a very small very light backup camera which may not even get used, is better than carrying a backup which is a lot larger and heavier when the camera gear is competing for space in my bag with things I may need for safety or comfort. My fear is having the 5D fail on day 2, and then my photography/camping trip becomes just a camping trip pretty quickly.
In the end I decided the M6 wasn't a fit because it used a different battery - If the 5D failed early, I'd need at least 2 batteries (if not more) and that starts to eliminate the weight and size savings over something like an EOS R (which could just use the LP-E6Ns I brought for the 5D). The RP would have been perfect if it took an LP-E6N: smaller, lighter, and cheaper than the R; bigger sensor, higher IQ, better low light than the M6.