It doesn't. It is not going to change anything. Calling out the wall or seeing it on the mini map won't make a difference.

It will actually make it better for solo queue players because there are many premades in the game who don't call out anything (or solo queue players who don't do that). Instead, they make call outs in discord (or whatever voice chat they are using), but solo queue players are suffering at the end.

Hence, premades are in benefit here. So the solution is to either reveal the wall or do not match up solo players with premades (more than 2 players at least - like league).

Maybe other abilities shouldn't be revealed because you can at least walk through them (not all) but the wall is very crucial to everyone in the game.