This is something that gets overlooked. It doesn't make sense on the surface of things does it?
You know why it happens though? When we do get the ball forward and we stick it on Lukaku, the players off the ball charge forward in straight lines, then we lose the ball, the simple pass through us to an opposition player on the half way line and suddenly we look clueless when the ball is anywhere but 10 yards in front of a bank of seven players.
We don't attack smart, so we consequently get countered ridiculously easy, and it breeds paranoia. How often do we 'dominate' (we don't, we just keep the ball, but fans of tippy tappy think we're 'battering' teams when we do it) and concede a goal? It's basically every single game at the moment and it all stems from the stupid way we set up to play football which has been figured out massively.