I think it's as simple as Oles setup and general coaching not being good enough, especially against the 532/352 of SU.
Constant examples of inadequacy of setup all over the pitch. As a result players looked devoid of ideas both in attacking positioning, movement, and defensively in pressing, marking.
It was embarrassing...for the whole 90 minutes.
And then we've got Martial, Rashford, Bruno playing like shit...because they're playing in this mishmash undrilled setup that has repeatedly brought huff puff no guile performances.
Add to that defenders being stupid, add up the variables, run the match, and you get that result....an infuriating one where you just know that of course it's Man Utd failing against the bottom team , can't score for toffee, "worst PL team ever".
Written in the stars....but it didn't have to be...if the coaching was better.
38 year old washed up unplayed CB keeping us at bay and getting motm. ... give me a break