A lot of cameras have bracketing--even the bridge camera I carry while hiking has it. I'm talking about HDR-aware bracketing that decides how many shots to shoot rather than simply shooting a fixed range. Imagine a shot in a building looking out the window with sky visible. You could have a range of 10 stops or more.

A modern full-frame camera will have 14 stops of dynamic range. Five shots 3 EVs apart is enough, you'll get a total of 29EVs of dynamic range. Well beyond your ability to actually tonemap properly. That's equivalent of, practically speaking, going from a shutter speed of 10 seconds to 1/3200ths of a second, and still having fourteen stops of headroom left (7 at both ends).

FWIW I can take pictures in a room with a window looking at the sky and change the exposure to clearly see both the sky and the room without even bracketing on a full frame camera.

Yeah, if you have a camera that pricey you could do it that way. Note, though, that you don't want to use all your dynamic range as the quality drops off.