You've touched on a few different points Owl so I'll try and break them down one by one. In my opinion....
Scholes was one of the best players ever but isn't the best pundit. He started off the programme by praising the improvement in overall play under Rangnick and worshipping Glen Hoddle (strange), and then ended it by suggesting we needed someone else. Total flip flop
I think the truth is Ralf is working with the remanents of Ole's team. He needs another couple of seasons to put his stamp on the team, whether that's as a front line coach, or as a consultant working with a manager like Ten Haag or Potch. It's always a fine line between reacting too quickly and backing a manager long term. But if we don't give this guy time then what's the point?
On the youth policy, we have the likes of Rashford, Elanga and McTominay playing in the first team, and kids such as Garner and Hanibal waiting in the wings. I think that is evidence that the United youth policy is still working, especially when you compare the players to have broken through vs our 'rivals'.
The worrying thing about the present situation is that we have a problem at both ends of the pitch in the form of Maguire and Ronaldo. Both might be hard to drop - Maguire is the captain and an expensive signing, while Ronny is a legend who is on ridiculous wages. I think the ballsy move now with Cavani out would be to try Rashford (who needs something to spark him into life) through the middle and drop Ronaldo. As for Harry, I just think dropping and stripping your captain just isn't the done thing halfway through the season. Maybe better to stick with it and hope he rediscovers his Euros form.
That's my two penny's worth