Off-axis compensated for by balance adjustment

Maybe some, go mono. It screws up stereo timing and warp who knows what. But sometimes depth csn change by recording, equipment, and song. If it disturbs you, it will probably be a rabbit whole ofmoney. Lol

Yes it can when the arrival time of each channel is identical.

Unless you have a hifi digital delay, don’t try this at home.

Somewhat.  I mean, it's not ideal but it's better than not using all the tools you have to make it better. :)

None symmetrical toe in is worth a try too.   

Yes for me it works well