While I enjoy running down England and have made any number of derisive remarks about Southgate, I repent of them for the moment. I'll give Southgate a 6/10 rating and predict England will get knocked out in the quarterfinals.
What Southgate got right:
1. Understanding the best thing he could do was make England Tottenham lite.
2. Understanding, I think, that they have one first class midfielder, Dele, and they will go as far as Dele can carry them.
3. Understanding his second best midfielder is Kane.
4. Having a plan and sticking to it.
6. Bringing a psychologist along.
What Southgate screwed up:
1. The whole backline + DM, which is too clever by half. Make Walker or Trippier the RB, maybe even play Trippier against weaker teams and Walker against stronger ones, but don't shoehorn them both into the backline. Dier is a good DM, but only when he can shift back and forth from DM to CM as appropriate. SImilarly, pick the two least bad CBs, and hope for the best. Just make sure neither one of them is named Stones.
2. He wants to be the popular girl by keeping most of his players in suspense as to whether they'll start or play. It seems to me he ought to have decided on his first team months ago and given them plenty of time to get used to each other. Tbf, lots of managers seem to do this, so maybe it's not as crazy as I think it is.
3. Bringing a psychologist along. Anyone who sees a psychologist ought to have his head examined.