I'm pretty certain England will remain a defensive side. I think this is one of the toughest jobs in the world simply because of all the attacking talent at their disposal, England don't have the midfield nor defence to play a controlling, attacking style of football that many want.
Reason why I am skeptical is that although Tuchel is a vastly more intelligent manager,, he still heavily relies on his players being clinical when they need to be. He'll always prioritise players who can contribute defensively over creating numerical attacking advantages. This can lead to pedestrian football. Chelsea fans and Bayern fans have expressed annoyance of the lack of attacking chances that are created. When players are clinical. Fantastic. When players aren't. It's awful.
People like to point to our Champions League final against City but we almost lost the Super Cup & Club World Cup because we couldn't put away the minimum amount of chances we created. We lost both domestic cup finals to Liverpool for also wasting the few chances we created. The Champions League final was almost an anomaly. (Helps Kante played the game of his life)
I look back at Southgate's tenure and too many times England created very little and weren't clinical when it mattered. Can Tuchel change that?