They might not be the ones running training sessions, but they do have a big hand in transfer strategy and hiring/firing managers. Right now the squad consists of the remains of a handful of different managerial regimes. It's a hodgepodge and that makes it that much harder to build a cohesive squad. That's not the (current) managers fault, or the players' fault. That is the responsibility of the sporting director/director of football, board, chairman, and owners.
I have a certain amount of sympathy for Amorim - he took on an incredibly difficult job and I am sure he's doing his best (though, it was his choice and is being very well paid). But he is committed to a certain system, and that system has never worked. A more flexible manager might be able to fashion something out of this squad, (though others have tried previously), but I think his commitment to the back three makes an already nearly impossible job properly impossible, without a full rebuild. Assuming it will ever work. Also, why did the top brass think this was going to work? They chose this manager and (should have) known what his tactical philosophy was. Did they vet that properly?
More and more Man Utd fans are focusing their ire at the owners, and don't see the club returning to success as long as the Glazers, and now, Ratcliffe, are running things. And I think they have a point.
Some would be upset about seeing Real Madrid in there, given recent history. I say bring it on. I want nothing better than to beat those mugs, and if we lose, whatever, it's such a ridiculously bloated group phase losses barely matter anymore.