It's not obvious to me that AP1 will ever reliably perform exit to exit driving, including autonomous lane changes. Right now, as I understand it, it depends on the ultrasound sensors to switch lanes. But that strikes me as a very unreliable mechanism, because it's completely oblivious to sudden traffic incursion within my flanks. At least, I would not trust it to do that, and would always check whether the coast is clear. This is because it literally cannot see further an a few feet out. AP2 has the necessary quarterpanel cameras to cover the flanks, but AP1 does not. Maybe during non rush hours with the coast largely clear, AP1 is fine. But not in typical Bay Area gridlocks.
Driving in the rain on the other hand, AP1 has already demonstrated its ability at. I always advocate hands on wheel of course, but with that done, it's very effective indeed.