Classic "Can't win the big one" manager or coach across sports. Regularly does well in the matches he's supposed to win. Battens down the hatches and doubles down on grinding out W's with predictable defensive tactics when it gets real. This rarely works against the best sides in team sports, whether the object batted around is spherical, oblong, a thin disc or a badminton birdie.
To borrow from poker and other games of probability, he does not play to his outs well. Failing to grasp that peak Donnarumma probably adds one to a level score a.e.t. and go for it in the Euro 2020 final remains his cardinal sin. Southgate and the FA both need a Jogi Low to follow this Klinsmann. The groundwork is now there, but their reputations depend on a tactician sealing the deal.
Credit where credit is due. He did very well after taking over at the nadir with the golden generation to replace and Allardyce's mess to clean up. His youth work continues to bear fruit. However, it's time for the program builder to go. What England needs is someone with the tactical nous to beat your guys with his guys, and his guys with your guys.