You just can't play offensively when your main striker destroys literally every attack. When the focal point of the attack ruins everything, doesn't work the defence at all and slows everything down if he manages to keep possession. Rooney drops 15 yards deep asks for the pass then immediately passes it 15-40 yards backwards rather than turn and run forwards. He shouldn't be dropping deep in the first place and when he does he then passes backwards which he also shouldn't do.
The few times Rooney either hasn't played or has gone off Utd have instantly improved dramatically.
Martial up top, Young on one wing, Depay(for lack of anyone else yet) on the other, Mata behind Martial and Herrera and Bastian in central mid with Darmian/Blind as fullbacks(till broke leg dude whose name I can't remember right now is back).
15mil a year, 300k a week, over double what 98% of the rest of the squad makes, Rooney can't be dropped I would say by the decision of the board. The worst thing Moyes did wasn't 7th, but being involved in giving that idiot 300k a week and for 5 freaking years.
Ultimately there are two possibilities, LVG is choosing to play Rooney, in which case he deserves to be fired, or the board have made playing Rooney something he's not allowed to mess with and it's the boards fault. I would still lean towards it being the boards decision, people say LVG is stubborn but he seems perfectly capable of turning on a player and being a relatively good judge of talent. The people it would hurt the worst for Rooney to not play is the board, commercially he's worth so much more playing that not and he certainly isn't worth anything on the pitch in football terms. LVG has no reason to play him, the board have every reason not to play him.