Hello Shagpile
A couple of points on your VEMD comments above:
You are correct, it has been around for over 25 years. The improvement/growth you are missing would be the Helionix system (in the larger aircraft)
Looking at one indicator for engine parameters seems pretty intuitive (FLI)
The “secret menus” are not secret, they are easily accessed. The ones you need in flight are accessed with one button (scroll), and
the other screens are to get to Overlimits, previous power checks, failure diagnostics etc. There is no need to access these in flight, though they have proved to be very useful for their intended purpose.
The Fadec would operate just fine with a total VEMD failure.
All the best
Rigidhead