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> If you set an autopilot to hold a heading, it will hold a heading. You don't have to supervise it, you can concentrate on other stuff.

Not _strictly_ true; faults can occur and the system always needs monitoring. Strong turbulence will also disconnect the autopilot (with appropriately attention-grabbing aural and visual alerts).

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Yes technical faults can happen or it might be physically impossible to keep the heading (because the engines are too weak to counter the wind). But still, the autopilot delivers what it promises and it is certified for. You can (or are supposed to) take your hands from the yoke when it is activated.

The cruise control is much more an autopilot than the lane assist, which is just an assist but wrongly advertised.

In a plane you have some space to react before you can take control of but on roads you're bound to other interacting factors as well like other drivers on road. If the FSD isn't 100% self capable then you're basically playing a calculated risk with an array of sensors and data.

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