"FSD does dumb things, you'd think this would be fixed already"
Neither of those two things are FSD, but are clearly under AP.
How is a person supposed to justify a purchase/subscription of FSD when basic AP related functionality doesn't work all that well?
Heck some people might get denied the FSD beta because of false FCW warnings.
Pretty much 98% of the FCW warnings I get are false alarms.
Now that isn't to say I don't have hope that FSD beta will address some of the issues. Supposedly it does recognize turn signals, and the Tesla Vision should improve things like auto-lane change into a lane next to a semi-truck. In the current version it has a hard time estimating the depth to the truck so it flashes between the two lanes.