I've never owned anything above 440C.
(which I recently acquired) All my knives, be they folding or fixed blade, have been 440A, 420HC (Buck) 4116 Krupp (Cold Steel) 1095, or 1065.
Personally, I've never felt the need or desire for a "super steel".
My Buck 110 (420HC) or Schrade 7OT/6OT (440A) can skin and butcher 2 deer without needing resharpened. Hitting them with a strop afterwards brings them back to arm hair shaving sharpness.
I don't have any one hand opening "modern" folders. I don't need one hand opening, and I dislike the way picket clips dig into my hand when I'm using a kinfe so equipped.
I carry and use traditional folders, usually multi-blade traditionals. (Stockman, Barlow, Canoe, Sunfish, etc.)
Using them to cut, be it cardboard, paper, leather, foam, electrical insulation (or up to 10 gauge wire, for that matter) or whittlin' fire sticks or tent stakes, I've never felt "under knived" with the 440A, 1095/1065, or any of the other "low end" steels. (of course the fact that they all have a good heat treat - including the Rough Riders, may have something to do with that.)
I very rarely have to put any of my knives to a stone. Even after 50 plus cuts of up to 10 gauge multi-strand wire, all they need is stropped to bring them back to shaving sharp.
For my uses, I don't need a "super steel".
Yes, I am aware that 440C is (or was) considered a "super steel".
I also consider the ability to sharpen in the field (if necessary) to be of prime importance.
I don't need something I need diamond stones to sharpen. Best case, I
might have a diamond stone in camp (if I owned a diamond stone) but I sure would not have one in my pocket. Worst case,
all of my knives can be sharpened with a smooth river rock, and stropped on my belt, should the need arise.
I don't baton, but I've never, in 50 plus years chipped an edge. I've seen many posts here of people chipping the edge on their "super steel" knife from batoning, or worse, the blade breaks.
At any rate, I'll continue to "get by" with the old, proven, "obsolete" blade steels.