Surely are......
However,
We have sadly seen recent incidents with Airbusses that are beginning to question the lack of situational awareness and inability to 'fly' the aeroplane in a non standard situation.
Back to our thread, what did impress me was the combination of a Garmin 496 and Dynon Flightdeck 180 in the RV12 I test flew late last year.
I was exploring things after the first few flight and all of a sudden it started shouting at me about terrain, sink rate etc etc - it was something of a shock !
I believe it came from the terrain data base of the Garmin via the Dynon.
I do agree - especially in most Vans aeroplanes, a system that would warn against overspeed/overload would be a stunning addition to the systems and a great aid for flight safety.