I regularly drive with no interventions on 11. So, if anything 12 has not degraded much
One thing we should all keep in mind is - FSD and robotaxi are not what it does. It is about what it doesn't i.e. see what mistakes FSD does in one month or one year (or ten years). For FSD to be robotaxi level, it needs to make no more than one mistake in 10 years of driving.
ps : But here is the important part - at any point the market might decide Tesla has "solved FSD" for no particular reason. So, we may have a Hertz or NACS moment that adds 30% or more to the SP.