Korg with it's "Archaic folder OS system" IMO is dead last on the list of "advanced" it really needs to be revamped too many steps to achieve things,...I will however say in Korgs defense that my Pa3x did off me very advanced editing features which I enjoyed.

"ADVANCED" is in the eye of the beholder as everyone has different skill levels to operate an Arranger KB.....
some never change because they are used to one brand & fiercely loyal,......some can operate any KB without problems and switch at will if needed. The level of difficulty can be easy or as hard and in depth as the player wants to dig in with only if he or she needs to go that far into the OS. Some never venture anymore deeper then just selecting a style, & sound and playing with great happiness,....others are tech dogs that need to constantly tweak the crap out of their sounds and styles, etc,....no one is right or wrong, It's what you enjoy & what it sounds like that YOUR happy with...