Edit: When I pre-ordered a Model 3 Musk’s promise at that time was literally “press a button and your car will work as a taxi to earn money when you’re not using it”.
There is some room to argue about the conditions under which the car can drive itself. If the car couldn't handle a high-grade, winding mountain road with an inch of snow on the ground and yet more coming down, I don't think too many people would be fussed is a "full self-driving" car said "uh, no" (especially as a good fraction of drivers couldn't handle that either).
To my end, if the car can't handle any condition that doesn't make me go "I think I should stay home," that should disqualify it.
But I don't think a "full self-driving" car refusing to drive in those conditions would be a deal breaker. I'd prefer it if autonomous vehicles were more conservative and just refused to drive in unsafe conditions.
We already had problems back when people started coming back from mandatory WFH and accident rate spiked, this would be essentially similar or worse, a bunch of drivers that might do 10k miles a year but drive 500 of them and have extremely rusty normal driving skill, let alone driving in bad conditions.
It would be essentially like letting your kid drive your car only in blizzard and pouring rain...
Full describes the set of use cases the car can drive in. All of them, not some with conditions and exceptions.
I think excluding off road / hazardous mountain roads etc. might be OK for the definition. And still cover many 9s of actual trips.
Driving into a parked ambulance is definitely a no no though.