Absolutely his "REAL" SHTF blades should be fixed and not folders at all. But a reliable "EDC" that can be used as a shtf knife until you can get to the bug out dug out, and equiptment proper, IMO a frame lock is the way to go because its "tougher" typically then your liner locks and lock backs in weapon mode. Don't get me wrong, you can ruin someone's day with a cheap dull knife if used appropriately, but I sturdy quality frame lock is IMO the best "tweener" for a folder in a weapon scenario.
And I'll reiterate, whatever you choose, a cheaper similar style blade IMO is imperitive to practice with, mainly your sharpening skills because in a shtf scenario you don't want to have a dull blade (and sharpening a blade can be very therapeutic in down time), but also the last thing you want to do is ruin a premium blade that you just invested into. Schrade, Boker, S&W (Taylor, same company that makes schrade these days makes s&w), or even a Buck would serve you well. I would just say look for the steel I mentioned above or 440c, unless its a Buck, then you can trust the 420hc... At least that way your "junk" blade isn't complete junk steel: Anything 440 (no c) or 420 or 7cr or less, "stainless steel" or "surgical steel" is all pretty much junk steel for durable knives.
Side note, an ESEE (or ka-bar Becker, or grindworx) fixed blade neck knife in 10 series carbon steel is about as rugged/raw as you can get. That's a great EDC and a great survival shtf knife to have; and easy to sharpen, and you still get one plus a cheaper schrade or condor version to practice with for right around $100 combined, and still have $100 left for a decent EDC folder...