Glass is great, but no glass alone doesn't make a photo. All those bells and whistles provide an experience and ability to capture something that otherwise could not. You could have the sharpest glass in the world, but if you cannot stabilize yourself for a slow shutter, and cannot use lighting in a way to improve the situation, that glass does you no good.
Some can only look at what they shoot and never look at all the other things many of us try to capture. My L lenses are quite good, I certainly see zero reason to go out and spend 2 to 3 times the costs of these to buy RF lenses. However I do want a body that can make things easier to shoot, open up other areas that give me grief now, etc. Sometimes that means I want lighter gear. Sometimes that means I don't want to pump the AF ON button about 2000 times in a shoot to make sure the person's eyes are in focus as I recompose and take the shot. Sometimes I am shooting low light, and my lenses don't have stabilization so I get blurry shots. Sometimes I need more DR. Sometimes I need really really high ISO. I want a body that can do that. Glass isn't going to help one iota there.
Canon is banking on the RF lenses to sell their mirrorless, that is quite clear. That Jedi mindtrick will work on some, not on the others.
Canon will add IBIS eventually, they will improve eye af, etc, but like sensor tech, they will likely run behind the competitors given their a) very slow methodical and conservative development and b) their playing games with really silly features instead of build or resolution or EVF quality.
The EOS-R is a good start.