While different, this list reminded me of why I do not enjoy using my M3 system. Despite the AF that could be better, it is a very capable system. But to hold the very small M3 with one hand, then zooming this tiny lens with the other just feels awkward. On a DSLR, just by being bigger, the same arrangement feels natural. Then on something small, awkward. Doing everything with one hand on the G7XII feels natural.
What can I say, ergonomics is real.
The EVF works (evf-dc1 mounted to the M3), but it is dead on your #2. With an OVF I feel like I am part of the scene so I enjoy the overall experience, so far my experience with EVFs is that I suddenly feel removed from the scene, like I am watching a video of the scene and I enjoy the experience less.
As a hobbyist, enjoyment of the experience is very high on my criteria for a camera. As I've watched, a number of the youtubers that have switched to Sony do not use the EVF. Landscape photographers and, of course, videographers seem to almost always be using the back panel LCD, and there the tilty-flippy screen of something like the A7R III is nice if not crucial. It is only a few that do portraits or travel photography that I've seen use the EVF.
So, I really wonder about this. I am still of the mind that Canon will have at least one more generation of DSLRs. If rumors are true, then the 1DxIII is next. I have not yet tried the R system, but I am thinking there is a good chance my reaction is similar to yours. It has been with the M system. So, if there is enough of us to constitute a market, I think Canon is smart enough to serve that market. We may not seen many new EF lenses, but the system is really well populated. So, here is hoping for a 5DV and a 6DIII that are very solid updates. We'll see in 2020 to 2021.