xplanephil
The advantage of the Piaggio Avanti is that you can do away with the prop heat completely, as the hot exhaust from the turboprop engine simply blows on the blades. Which makes for a very nice anti-ice system.
An airplane autopilot is a dumb device, in that it does execute _exactly_ the plan you tell it to, and it is up to the pilot to at all times decide whether the current plan still makes sense or needs to be altered. So the pilot makes the strategic decisions, and leaves most of the physical tasks of flying to the autopilot.
I find myself using my M3 w/FSD in exactly the same way, as that I put on autosteer pretty much immediately when I'm out of the driveway, but I constantly nudge it into the lane that I want it to be in (by using the turn signal) or push the accelerator when I think it is taking too long pondering a turn. So i leave the physical driving (keep lane and distance) to the car but manage the car to always go exactly where I want it.
I have no trouble staying alert this way when doing medium long drives. Long highway drives where autopilot is so good that it requires no manual interaction is where the trouble starts and I find it hard to keep paying attention.
This is where in an airplane you have a copilot and can discuss strategic things like overnight stops, fuel stops, etc... Maybe Tesla needs a built-in chatbot to make me do that :)