I sometimes fly a 172 with G1000. I know how about 2% of it works. Does that mean I shouldn't be flying it? - I can use the basic flight instruments, the radios, the transponder, the VOR and ADF and ILS and GPS, but there's vast amounts of it still unknown. Are you really saying that nobody should fly such an aircraft until they know all 487 different ways of inputting a waypoint?
(Don't worry, I won't be trying an instrument approach in IMC on my own until I've learned another 2% or so
Then we will have to differ, I wouldn't fly it if I didn't know how it worked. Maybe it's just me. I see your point about the a/c being safe to fly whether it's fitted or not. I just like to know how stuff works if it's fitted and I'm not happy if I don't know how it works.