There’s a good chance the limitless autobahn is actually part of what makes German numbers so good

There’s a chance, but I don’t think you argued why would it be a good chance.

It just requires stricter training and policing, stricter TÜV and for people to always check their mirrors before switching lanes.

Changing lanes and overtaking are always some of the most risky moments. It’s always going to be much much safer if everybody drives the same speed vs. if you have to dodge because people are going 250 km/h for lulz. If you have the stricter training and policing, you still can improve safety by introducing speed limits.