Absolutely 100% true!
United were a graveyard of talent and when undertaker Ten Hag arrived it only got worse. Only Casemiro or a similar player who has already won everything he could (5 Champions Leagues like Casemiro) and is now looking only for a fat contract can go to United in a clear mind.
Everyone has already seen that United is a swamp, so it will be extremely difficult to lure any promising player there (not to mention top players).
I don't know what happened to MU, they haven't been able to get out of the inconsistent zone. The team development carried out by several managers after Sir Alex Ferguson, could not bring glory to that era. It's difficult to find the right replacement of Sir Alex Ferguson. Arsenal is lucky after Arsen Wenger, currently there is Arteta who seems to be able to make Arsenal grow even though he experienced a difficult phase which made Arteta receive a lot of criticism from fans.