Games at International level in midfield are won and lost in midfield.
At the moment we're easy to play against, stop Foden and Sterling (or any of our wide players) and you stop England as there is no creativity in the middle, Kane is being hammered for his performances but he has to continually drop deeper into midfield to create on his own and with Foden and Sterling often being double teamed he's frustrated.
I understand the fans clamour for Grealish as other than Foden, he's our only other creative player in the squad. We're desperate for a David Silva type skill set, someone to be able to take a touch and spin away from their man into space. For someone that Stones and Walker are be able to play the ball to with confidence.
Look at the central midfielders in the squad; Rice, Phillips, Henderson, Bellingham, Mount none of them have the ability to do that. our only options is for Foden to drop into the middle or Grealish comes in.
I don't think Southgate has it in him to make that decision, his substitutions v Scotland were just daft, replacing like for like and keeping on an out of form Sterling and bringing on an out of form Rashford.
My overall take is that Southgate wants to play a Pep style possession based game but he's trying to do that with a Klopp style midfield.
Bad team selection is just a trait of England managers. Sven had arguably our greatest ever squad and still messed up team selections again and again. For me, that is the most annoying period of English football as we should have won the World Cup in 2002.