Right, but other file managers didn't adopt them. Do you use Norton Commander keyboard shortcuts with Nautilus, Dolphin, Thunar, Windows Explorer, Finder, etc? Did anything else adopt most of them? Because if you're only appealing to those who used Norton Commander, that's not a big user base. Using Windows Explorer keyboard shortcuts, instead, would give you a vastly larger audience.

None of those things existed when either program was written though, except maybe a very early Finder.