The thing is, if you can't take a nap or let the car drive you home after drinking a skin full, what is the point in the system?
People who use "FSD (Supervised)" claim it's more relaxing than hand-driving all the time. Honestly, it should just be called "Autopilot", because it's more akin to the autopilot functions of a modern airplane. Those are capable of flying an airplane, but are supposed to be monitored, with human pilot(s) ready to take over at any time.
Teslas certainly do have a very keen "Driver assistance" system with cameras pointing in every direction and a computer capable of evaluating traffic and other things constantly with a full 360 degree field of view, something that human vision is simply not capable of. That computer also doesn't get distracted by things like a cell phone, nor does it get road rage. The biggest question is whether that computer's judgement is up-to-snuff. Of course, one might ask the same question about many human drivers too.
Personally, I think I would find it more stressful to "supervise" FSD all the time than to just do the driving myself while letting the car supervise me and warn me of anything I might be missing.