Personally, I've seen Ince, Robson, Keane, Scholes, Carrick, Fletcher, Scholes.
Can we flip the argument?
We could literally say it for every single position on the park:
We've seen full backs of the caliber of Irwin, Eva, Heinze and G.Neville, but now we have Telles, Dalot, Shaw and AWB.
We used to have brilliant centerbacks like Bruce, Pallister, Stam, Ferdinand, Vidic, now we have Maguire and Lindelof.
We used to have Kanchelskis, Giggle, now we have Rashford, Diallo and Elanga.
We used to have Ruud Van Nilstelooy, Cole, Cantona, Hughes, Yorke, Ole, Van Persie, now we have an ageing duo of Cavani and Ronaldo.
Singling out one individual is just plain insane. As a first XI we are a shadow of what we once were. Upgrading Scott McTominay isn't going to do anything. Upgrading any one player won't make a difference.
Bruno made a difference, for a brief period. But it's a case of root and branch, not one single branch.