Your example about trains is actually incorrect, not just in that most trains are "basically" automated, but in that some (long-distance) have actually been for a long time.

>Its going to be far easier for Waymo to take their existing mastery of traffi

I'm going to stop you right there. The whole comparison is theoretical, and I just realized you don't even understand they are in entirely different markets and are trying to make a concrete point. FSD is for customers but Waymo isn't man. Good day