Mirth Maguire would have made zero difference to England. I seen people moaning about Burn again yesterday but he proved worth his place as 4th choice CB against Norway. None of who Tuchel didn't bring would have changed anything.
This generation of English players is chock full of 10s who could have played almost any generation for England and then Rice. Kanes time is pretty much over and there are no other top strikers there with none coming through. Its time to pivot to Max and Ngumoha as wide options IMO. Not starters yet but this is when I'd start integrating them.
England also have a terrible crop of defenders relative to the norm. There are no Adams, Terry, Sol, Rio, etc types there any more. No England defender would get into our team for instance. Have they anyone coming through who could reach that level apart from Salmon, and he'll still only be 20 next world cup.