I'm genuinely very interested to see how this joystick dial works in the real world. I feel like Canon had to have learned from the touch-bar to not do this kind of thing without feedback from actual users, so I'm fairly confident Canon had to have gotten good feedback on it. To me, with the closer photos, it actually looks pretty nice. Seems like there's plenty of space between the joystick and the wheel to stop inadvertent changes, and looks like a natural position for the thumb to use both while gripping the camera firmly.
Odd to me that there's no third dial, but again, the control ring on the lens can make up for that. A little annoying though when you consider the big white supertelephoto RF lenses don't have a control ring, so with those you'd be limited to the rear aperture wheel and the shutter wheel. But, if you're using the control ring adapter and EF supertelephoto lenses, you still have a third ring.
Additionally, the added "ISO" button probably means Canon expects users to change ISO the old fashioned way, using the button + shutter wheel like on EF cameras.
Overall, it seems like the intent with these cameras is to be compact and cheap over anything else. I'll be interested to see how cheap. The R10 definitely screams "$800 or less" to me, but we'll see.
I think one missed part of this is, the R5, and likely the future "R5s" or whatever it gets called, are probably somewhat compensating for the flagship crop sensor spot of the original 7D. Already tons of wildlife and sports photographers who need 1.6x are using the R5 successfully in the crop sensor mode. The "R5s" when it comes out will almost definitely have a 32 megapixel crop mode, if not higher. If they pull off a high framerate, or allow faster FPS in crop mode, that could functionally be a pro-style 7D equivalent.
That leaves more room for the R7 to be more of a 90D-style camera, with a little more compactness for those traveling and needing to save room. If that helps bring the price down, I think that honestly helps the R7 sell more to consumers in general.