I get that different folks want different things, but I suspect within a certain more narrow range then is currently being offered. It strikes me, and I am admittedly frightfully new at this, that a Hiking Buddy, to stay with your example, is hardly ever gonna see use as a Bushcraft knife. Can you imagine anyone seriously batoning or whacking little pieces of firewood with it? Its an EDC, (box opener, letter opener, cord cutter) sized thing and it could definitely serve in bird and trout cleaning, and small meal food prep role. Could it do more in a pinch - sure, but would you choose it or buy it anticipating that? So, 1/8 or 3/32 seems about right for this.
The Bushcrafter, or other bush crafting designs are targeting , that heavier use, so heavier stock to protect the blade from impact and twist damage makes sense. 5/32, you bet. 1/8, depending that you see your app more for slicing than whacking, OK, I get those offerings. 3/32? No way. Why would anybody, or mostly anybody want one set up that way? Regards the Runt, it seems in a category all its own. Theres never enough available, so guys will buy what comes along. Gonna clean a salmon? No. Gonna butcher a deer, or Elk or Moose or Elephant, of course not. Though somebody will no doubt try just to prove a point. Some models, (many, most?) get bought on esthetics not on functionality. To me the Runt is one of those. The 5/32 TT Runts Ive seen are particularly attractive, given the addition of the edge appearance to the short sinuous, flowing lines of the thing. My Spyderco Techno, has a similar thuggish, curvaceous look to it. And the different blade thicknesses have practically no impact, Im guessing on the way a Runt gets actually used. All Im trying to say here is certain models, independent of the Runt and a couple others, clearly are designed for uses, most of the time. If Andy tries to make every model with every blade thickness, all the time, then stuff backs up as many of us will wait for what we believe is an optimum, choice.