That last point depends strongly on the camera. I almost never have to take my D500 away from my face when I'm setting up a shot, because it has physical controls for the exposure parameters and displays in the viewfinder to show changes of setting - not just shutter speed, aperture, and ISO, but even down to stuff like bracketing and flash exposure compensation. Granted, a lot of DSLRs, especially the prosumer ones, don't benefit from such thoughtful (and expensive!) design. But you absolutely can get cameras that are ergonomic to operate.
(Well, if you buy Nikon, anyway. I don't know who does Canon's UI design, but whoever they are, they could be a lot better at it...)
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That last point depends strongly on the camera. I almost never have to take my D500 away from my face when I'm setting up a shot, because it has physical controls for the exposure parameters and displays in the viewfinder to show changes of setting - not just shutter speed, aperture, and ISO, but even down to stuff like bracketing and flash exposure compensation. Granted, a lot of DSLRs, especially the prosumer ones, don't benefit from such thoughtful (and expensive!) design. But you absolutely can get cameras that are ergonomic to operate.
(Well, if you buy Nikon, anyway. I don't know who does Canon's UI design, but whoever they are, they could be a lot better at it...)