The NHTSA reported in April that most fatal FSD crashes involved no driver intervention, or driver intervention only in the last 1 second, and in all cases an attentive driver could have perceived and taken steps to lessen the severity of damage and injuries in the crash.
For anything less than SAE Level 4, the human MUST take over driving when requested. The question is, can we? Sign up for the beta test and find out, I guess!
Personally I would much prefer a new Mercedes E class wagon with Driver Assist (Distronic) to a Tesla with FSD.