England are strong at the back partly because Phillips and Rice sit in front of the centre backs. If you left Maguire and Stones to deal with attackers without cover then the defence would look more suspect.The back 7 when you're strongest areas player wise are attacking is not a decent system, it was unnecessary and cowardly, allowed England to rack up clean sheet stats against largely weak opposition, and absolutely should be thrown out.
It was boring and functional, limited Kane, and people got overexcited with wins over a past it Germany and a poor Ukraine.
Stones is meant to be great on the ball, but he never really brings it out and Maguire only hits long balls. Compare it to how old man Chiellini gets around the park.
If you go back to Italia 90 England played more or less the same way as they did in this tournament, but with Mark Wright in a more free role bringing the ball out while Butcher and Des Walker stayed behind and, when the full backs dropped back, Wright could also push up and challenge an opposing midfielder. England have to get much more out of John Stones basically.