It is odd that a simple facia change is "gen 2" while dual motor and AP were not <g>
When I got into heavy research mode last year I knew of the "20 changes per week" and was really surprised there wasn't a website that listed some of the bigger ones that customers noticed and the approximate VIN when they happened. Like folding mirrors, the various sound systems, next-gen seat availability, etc. It would help when looking at CPO cars.