failure to monitor the basics and perhaps an over reliance of AP.
Should aircraft have an AFCS mode which will kill you if you don't pay attention? Yes it is fundamental to being a pilot to monitor your instruments but this issue should be pushed out to mitigate the risk a bit. Basic 3-axis vertical modes (ALT, VS) are just plain dangerous if you don't know the risks at low collective settings. Want to scare yourself next time you're up? Just engage ALT at height and put the lever down. Watch the airspeed wash off and the aircraft fall out of the sky. Horrific.