I'd like to help beat this dead horse a bit...
I've had my Canon EOS 77D, a 24 megapixel camera with Canon's DIGIC 7 processor, for several months now. I bought it because I had no experience with mirrorless and didn't really know anything about it.
My wife was tired of me leaving the 77D on various manual settings or with random lenses on, she couldn't just pick it up and take pictures. I bought her a cheap Canon EOS M100 a couple of weeks ago as an early Christmas present. Camera is about as stripped-down of on-body controls as you can get, almost all of the settings are through on-screen menus, but the heart of the M100 is the same 24 megapixel sensor with dual-pixel autofocus and same DIGIC 7 processor as that 77D.
I've played with the M100 a bit now, both with the 15-45mm EFM kit-lens for outdoors/bright light settings and with my 24mm f/2.8 EFS pancake lens on an adapter for indoors/darker lighting, and based on using that 24mm, we went out and bought the 22mm f/2 EFM pancake lens for indoors shooting. Both the native zoom lens and native prime lens are wonderful, and are incredibly small and easy to carry, providing excellent image quality simply because the lens designs don't have to leave an extra full inch between the lens and the sensor to make room for the mirror, and for the APS-C sensor, aren't based on designs that might originally have been for full-frame and don't use a mounting-flange designed to clear a 36mm by 24mm sensor. In short, being sized for the sensor and without a mirror, everything can be smaller and can still produce image quality rivaling the same sensor on a Canon DSLR.
I love shooting with my 77D, but had I known what mirrorless was about back when I was camera shopping, it's very likely I'd have ended up with either an M5, M6 with add-on viewfinder, or an M50, and not with another DSLR. But because I'd had years of hobbyist experience with a Rebel XS, I went with what was familiar in camera body size, and as such I have a fairly large camera backpack full of moderately large lenses. I won't be replacing the 77D anytime soon, and arguably there are still plenty of situations where I'd have to go with an EF or EFS lens and an adapter to get the right lens for the right setting, but I'd probably still be ahead of the game in size and weight even if I had to carry that adapter for decent telephoto zoom or for that power-zoom-control 18-135mm for video. Mirrorless is the direction of the future, so long as manufacturers figure out what they need. Sony seems to have gotten it, Canon is on its way. Others I couldn't say, but I suspect they're going to figure it out too if they still want to sell products.