Ok full backs? Come on. Shaw and TAA, if both are on form, are as good as any full back pair in the world (IMO the best pair on paper). Pickford is shite yeah, but he shouldn't be starting or in the squad at all. Again, selection issues, Henderson and Pope are both very good keepers. Henderson is far from a terrible midfielder. Phillips is decent, Rice is good and young (but a defensive mid so a pair with Henderson can be too 1 dimensional), Mount and Maddison are both very good midfielders who could work in a 3 along with Grealish being the most advanced mid. Bellingham is one of the most promising midfielders around. Foden as depth to Grealish and adding creativity in a midfield 3. Loads of options, up to a manager to pick the right mix and get them to play together. But the quality is there.
And again, Maguire, Gomez and Stones are all very good centerbacks. Stones next to Maguire doesn't work and outside of Peps system he's shit IMO, but Gomez when fit makes a good partner to Maguire (and you have the understanding to either fullback through their clubs with TAA and Shaw).
Henderson
TAA Gomez Maguire Shaw
Henderson
Mount Grealish
Sancho Kane Rashford
Is really what the lineup should be for me. Swap Sterling in there maybe but I prefer Sancho and Rashford as the other 2 in there. Loads of creativity and well balanced. Against certain opposition swap Mount for Rice and make it a 4231. Quality is there, on player level. Southgate has no business being the manager of that though, and it's obvious when he makes his selections that he's out of his depth.