Have you ever considered it's because we haven't had a world class attacking coach in that time? I find it hilarious how people always jump to blame the players when it's abundantly clear that offensively we have been crap for years.
According to the Cafe, world class players like Di Maria, Mata, Sanchez all magically turned into crap players when they joined us, and it was just coincidence. Then you look at others like Depay, Mkhitaryan, Martial, Rashford, players who have enough quality to be good players in a good system but are/were inconsistent and only good in moments. Conversely, see someone like Sterling, not a world class player by any means but plays in a side that is coached in great detail so he knows exactly what he needs to do in certain areas, exactly where his teammates will be, exactly what movements to make etc etc.
This is why I'm dubious of hiring Ole permanently. Like it or not, he was schooled by Tuchel last night. I'm not sure what type of coach he is. If he is very much in the Fergie mould, I'm not sure that will cut it any more.