I have the new Tesla Nav since two months. (*)
In my experience, which is daily commute of 80 miles and a vacation to south of France (1200 miles), the routing is on par or even better than waze’s.
At first,I did not believe the rerouting that it would propose but then had to experience the hard way the reason of the rerouting, which were surprisingly recent events that the nav was already aware off: accidents or route closed.
Examples: a car crash on the highway that happened like 15’ before we reached it, with detour mandated by police. A new road construction that had started that same day, resulting in a closed route.
So I’ve come to fully trust the nav’s proposals, which was absolutely not the case with the previous one.
What is missing compared to Waze is that you don’t see the accident or roadwork and road closed information. But at the same time, the Waze map is often too cluttered with all those events in our region (in particular road works: election year and every local mayors decided to scramble on fixing roads to win some points). So I’m not sure I’d welcome the added info making the map too busy.
Anyway, sure Waze has still features that the new nav does not do, but if you just need the nav guiding you efficiently, no need for Waze in my humble experience.
(*) the new nav, is the one that is explained here ,
and apparently still not pushed to all unfortunately.