I can't disagree with Jim Ratcliffe's plans, if I can add, I will suggest him to sell Mount and Onana before their market cap decline to much. Selling these five players will make Manchester United to have a good amount of money to buy top players from other league or Championship.
In addition I also do not agree if they sell mount and onana, the weakness of Man United is currently in defense and what they need to evaluate is that position. The injury of Martinez and Luke Shaw really made Ma United's defense worse. Still lucky because Bissaka has recovered so there is a little convenience for Erik Ten the right to integrate defense. In my opinion, the problem in the body of Man United is not on Onana or Mason Mount because if the team plays solid they can also adapt well.
For Martial and Sancho, I agree if Jim Ratcliffe wants to sell them because these two players will be a burden on the club. These two players have large salaries that the club must pay while neither has made any contribution so far. Selling these two players could also help Erik Ten to find other players who play in defense so he can combine players if he faces injuries like now.