How were the Nazis technocrats? The core of the Nazi party were weirdo political extremists and violently nationalistic army veterans. The only example I can think of which matches your idea of an 'extraordinarily capable technocratic leader' is Speer, and like his military counterpart Rommel, his reputation has been somewhat laundered and propagandised both during and after the war.

Speer was an academic failure. Also as architect, except the Nuremberg lightshow.

But he was extremely successful as manager then. Just like the ex-NAZI NASA leader then a bit later.

That was the golden time of German management.