Yes, but a lot also rarely changes. I wonder if they ever considered a hybrid approach that uses some of the more stable map data as a default which can be overridden by the computer vision system.
I reckon Tesla will eventually do this, and also eventually incorporate LIDAR. But they're attacking the hardest problem first (in the sense of "no one knows how to do this").
It takes at least decade to build up something like Google Maps, but a lot of the data is already out-of-date.