I think the disagreement we might have is that I didn't see England's weak first half as a coaching problem, more like that some of England's players, particularly Sterling, did not make the correct play at certain times which limited their chances for real scoring opportunities. When Grealish came on and Sterling moved moved over, there was better, more incisive play which created the two goals.
I also think it's not particularly fair to say that each team had two good chances created for them, and assess that to the tactics of the manager(s). Germany's first scoring chance with Werner imo was not an amazing opportunity; the pass took Werner wide and Stones really closed down the angle and Pickford did a great job rushing him so it was actually a pretty difficult finish. The second chance was a great chance to score, but was also created by just a terrible give-away which is basically luck. England's two chances were straight tap-ins.