I've been looking at the principles you mention but from a different angle. I think that in principle they at least partly describe why more people don't play RPGs.
Are you asking if it's better to hide the mechanics from players to make them take more risks? That might work the first time but they'll quickly hit a level of risk that is too painful and ratchet it down to a safer level.
A good example of this is a video game. Players don't really know the mechanics underlying the game but after a few errors, they figure out what kinds of action get them killed and avoid them.