K390 is also surprisingly corrosion resistant in the kitchen. You did a low temper on your 10V gyuto, right? Have you also tried 10V with high temper? If yes, is there a big difference in corrosion resistance?
So, using a low-toughness steel doesn't make much sense, does it? What about something like 4V/V4E? This is an excellent PM steel that can take a lot of abuse as we can see from Bladesports competitions.
Guys, can someone define a "workhorse" for us briefly? Is it about blade grind? Or is it about steel toughness/edge retention? Or is it something else?
What's wrong with testing and comparing different grades of steel? Why not compare plain carbon steels, stainless steels, cold work tool steels and high speed steels under the same test conditions and see which steel is the best and most aggressive cutter/slicer?