Aviation autopilots handle flying duties in a giant expanse of open sky. It's a way, way easier job to do than navigating a highway from behind a steering wheel.

So even if the "capabilities" may be comparable between the two systems, the amount of supervision they require is not, so I don't think they should use the term. It may be "lane-keeping cruise control" isn't nearly as sexy, but it doesn't establish unrealistic expectations which get people killed.