In article , Peter Duniho
wrote:

Simple enough, IMHO. The main problem is that, for some reason, pilots who
are introduced to turbocharged aircraft are often not told about the need to
avoid full-rich mixture settings at high density altitudes. This was true
of me (I found out myself the hard way...only took two high altitude
landings for me to figure it out though ), and it's apparently true of
other pilots as well.

The real problem is, most pilots are flat-landers.
There just is not the opportunity to train pilots in the real world
environment until they actually get there.