The Red Devils decision to make Amorim the new coach was the right move given his coaching ability, he has shown great ability at Sporting and many hope he can bring better and innovative tactical approaches and changes to Manchester United later, but the sacking of RVN is something controversial in my opinion after what he did as their interim manager, RVN is a legend and he knows a lot about how to coach a team so manchester united should have considered giving him an assistant coaching position or become a youth team coach instead of sacking him, RVN was previously contracted as ten hag staff and actually he has a long-term contract with manchester united but I think the arrival of amorim has changed RVN fate at this time and made him unemployed 
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Signing Ruben Amorim as the new head coach of Manchester United sr team was the right decision they made, it came late because they waited for Ten Hag to cause most of this damage for the team, because if they signed him earlier than now, the team might have been contesting for top four by now; but it is not too late for Manchester United because with the qualities Amorim have as a coach based on what we have seen in his last team, he is capable of bringing glory back to Manchester United..On the departure of Ruud Van Nistelrooy, I think it was because Amorim wanted to work with his complete coaching staff, and Manchester United will not want to risk anything so they will not be responsible if the new coach fails to make the team great again. Sin Ruud Van Nistelrooy is a legend of Manchester United, I think it will not be a problem and he can be called when his help is needed in the team anytime.