In this video, Michael the Maven goes over shortcomings in the usability of the Canon EOS R mirrorless camera and contrasts them with what he has found as the superior usability design of the Nikon Z7 mirrorless camera.
Canon obviously designed many things very well in the popular EOS R, and I believe the control ring controls are the most obvious example of that. However, like Michael, I have some usability issues with how the Canon EOS R was designed.
I think he is dead-on with his point about the location of the power switch and that that location should be a multifunction mode selector like Canon had in previous cameras and Nikon has in the Z series cameras. I simply can't understand using so much camera real estate for just an on-off switch.
I find the AF-ON button much more ergonomically friendly than Canon's location and like in the video, I find the joystick indispensable. On the Canon, I feel my thumb that is holding the camera far too close to the edge to be comfortable.
If I were going to buy a mirrorless camera system right now, between the Canon and the Nikon, the Z series would win hands down. Both have their strengths and weaknesses, but I feel Nikon did a bit better in their initial release, and with a better ergonomic and usable design, it will be easier for seasoned photographers to transition to the smaller camera.