I was talking about if you have a vocal panned left and you delayed it to the right to create that room that was mentioned above, this is a stupid choice to make for a vocal when you have so many other options, you create space in the middle, this is specifically the reason why it's done, but definitely not for a vocal.
Yes, delays can be used for a fake room, but not by panning a vocal left and a delay right. You'd keep vocal center, and use a slap stereo delay. Very common
Panning an XY hard left and right leaves little to no hole in the middle no, but you lose the center channel, ie: in mono your vocal would drop considerably in volume which is a problem in and of itself when trying to strike that balance of a vocal to sit correctly on all listening devices. a spaced pair will be wider and leaves more space in the middle but still a terrible choice, there is that volume drop in mono, the problem with the singer moving, potential phase problems, loss of center focus which is important to create contrast, nothing to gain, everything to lose.
that center vocal track is my anchor point to which every other mixing decision comes. You don't want to be losing that. If you think you are going to break new bounds by panning a vocal off to the side and creating a fake room with a delay then you are sorely mistaken, I assure you.
Double tracking and hard panning leaves more space in the middle, double tracking with a different part in a different register with a different instrument leaves most. But I'm not concerned with any hole in the middle. I am concerned about losing power, intimacy, punch, in your face, dry sound that really needs to be placed down the center especially for a vocal. I am not trying to convince you LBS. struggle on.