i forgot about blackburn - someone responded on wood central that he'd done a presentation at williamsburg with a claim of something like "any plane, any wood, any direction". (cap iron).
The interesting thing is he would give a presentation like this and back then, people were just recording video, and nobody ever mentioned anything about it for at least a year (or three?). How do you see a demonstration like that and not find it useful.
There's a local Marc Adams student here who set up a woodworking school and I said "have a look at this" (he bought my old bench for one of his beginning students). I took a huge leaf off of a piece of curly maple with a and he looked like he'd seen a ghost. He recognized what he just saw immediately, but said that he teaches the students to do most of the stuff with power tools and sanding and use hand planes for fitting etc (I get it, that's typical), but has had a handful of students who said they'd like to work entirely by hand. I told him I wasn't looking to teach any classes to people, neither making planes nor using them as I figured that of that , if one actually stuck it out, that would be my high estimate. Not that people wouldn't do it, but it feels like exercise when you do it.
At any rate, if blackburn said what I mentioned above about any plane any direction and he meant it the way I think he did, then it's right on the mark. And nobody in person seemed to think it was worth repeating.