England have very good players, but they don't have talismanic players that can win games with a moment of brilliance. The history of the tournament shows that unless you are extremely well organised and effective, you don't have a chance against the talisman led teams.
Southgate sets up the team the way he does because he knows this.
This team would be cut through like butter in a moment of CR7, Messi, Mbappe brilliance. Southgate knows this.