the answer is always the same: it depends.
let,s say you have a low-pitch singer, and you can't get a sparkle out of his voice. get him to sing near a glass window so some high end will be heard. a dead room can't do that.
in another case, if you have a boomy room, you will certainly not track some drums in there.
in my experience, total dead rooms never give great results on track. recordings come with no "space".
you should just treat the room so that it does not create unwanted reverbs or stationary waves, so school yourself on bass traps, wall absorbers and wall hangers.