The issue with this is that McTominay isn't actually very good at pressing or workrate. He's made to look better than he is because his direct competitors are Pogba and Matic (who are both even worse), but when comparing him to other midfielders he's comfortably below average. This season so far he is in the bottom 31% of all midfielders in the top 5 leagues for how often he attempts to press, which is actually an improvement over last season (bottom 21%) and the previous season (bottom 5%
).
What he is quite good at is blocking and intercepting passes. But in total when I went through most of the decent midfielders in the league last season, Scott was 20th for winning the ball back out of 26 players. That's with interceptions, winning tackles and successful presses all added together. The only midfielders who won the ball back less than him per game were Xhaka, Sissoko, Soucek, Matic, Tielemans and Pogba. The fact that we had three of the bottom seven really highlights part of our issue, and also how reliant we are on Fred in that regard (who was the third best behind only Ndidi and Kante).
Scott might improve with proper coaching now under Rangnick, but he needs to because if he's not very good at that aspect then he really doesn't bring anything else to compensate.