V12 main defining feature imo is not a driving feature but a new training feature. It can finally train within itself, ai vs ai without human input. No more labeling, and it's the path to be 10x safer than a human. This has been the holy grail the ai self driving community has been chasing after but it was difficult to translate image space into vector space. Tesla's occupancy network was a just building block phase to get it done.
This is the alpha go zero of fsd.
"AlphaGo Zero, a version created without using data from human games, and stronger than any previous version.
[1] By playing games against itself, AlphaGo Zero surpassed the strength of
AlphaGo Lee in three days by winning 100 games to 0, reached the level of
AlphaGo Master in 21 days, and exceeded all the old versions in 40 days.
[2]"
en.m.wikipedia.org