Here are some advantages I thought of.
- More likely to excite all of the room modes evenly, allowing for smoother bass.
- Corner speakers take up less floor space.
- Sensitivity. If you are designing for the corner, your crossover design may end up creating a speaker that is 3-6 dB or more sensitive than it would have been otherwise, allowing for the use of smaller amps.
As for imaging depth, that's a personal value thing. I think sometimes we place too much on depth and spacial reproduction, even when it's not real. That is, I think some systems create a perception of location that has no relationship with what we would hear live. Like I said though, this is a personal value thing. :) I'd trade for instance, smooth and accurate timbre for hyper-etched 3D localization of instruments if I had to make a choice.
Best,
Erik