People don't know what "autopilot"s actually do.
"Autopilot" seems like a perfectly reasonable name for it to me. At least if you know what autopilots in normal small planes -- or even $50m ones -- actually do.
The autopilots found in virtually all aircraft will stupidly hold the altitude and direction you tell them, and will happily fly you straight into the side of a mountain or another aircraft.
Remember Germanwings Flight 9525? That was an Airbus A320, with one of the most sophisticated autopilots you'll find in a civilian aircraft. But tell it to fly at 100 ft and that's exactly what it will do.
Traditionally an autopilot's most fundamental task is keeping the plane level and relatively straight so the pilot can spend a few seconds or a minute or two reading the map.
Second is altitude hold. Simple ones just let you maintain the current altitude when you turn it on (same air pressure). More complex let you program a target altitude and will automatically climb or descend to it (but in small planes you have to watch the speed and adjust the throttle yourself).
Third is heading hold. Simple ones just maintain the current heading when you enable it. More complex let you move a "bug" on a kind of compass display to set a new heading. Historically, that's twin engine or small turboprop territory. More expensive still will automatically follow a path directly to or from a "VOR" or "ILS" radio beacon.
Fourth is speed control. Historically this is definitely only bigger planes. Otherwise you set the throttle yourself and you get whatever speed you get.
That's the historical state of the art, up until well under 20 years ago when GPS started to get approved for aircraft navigation. That lets you program in more complex and less restricted flight paths.
But it still knows nothing about mountains. At the most, some autopilots know about the Minimum Safe Altitude (MSA) in the current area -- that is an altitude 1000 ft above the highest point in a 25 mile radius.
As for avoiding other aircraft, the "TCAS" system was introduced around 1990 (but very rare then). This allows planes to pick up the radar transponder replies from other aircraft, determine where they are, and warn the pilot if there is a possible collision. This is now required for aircraft with more than 19 passengers, but in almost all cases it only gives a voice warning to the pilot who must still manually respond. It is also limited to telling the pilot to climb or descend to avoid the other aircraft, never to turn.
In 2013 Airbus announced the availability of retrofitting integration of TCAS with the autopilot across their range. The A380 (only) had the ability for a few years already. Given the reluctance of airlines to spend money, and the size of fleets, this will have made its way into only a tiny percentage of planes by now.