Flashes on icebox

Me and a friend were having a discussion about flashes on icebox.
I believe that flashes are always nice to have, but not a necessity. On icebox A site there are too many spots to hide behind so the flashes don't hit.
But they keep insisting that flashes are a must. What do u guys think?

even smokes doesnt matter in bronze so chill dont take stress

Gekko is the truth on icebox