And some people are not so good at abstract mathematical assessments and highly specialized system analysis.
I don't know about you, but I'd find it a lot easier to explain to someone that X,Y,Z are the skills you're good at, because they match your high stats, than I would in training somebody to use various social techniques.
Theatrics are way beyond my ability to coach people on.
Does the design derive from the "gamers lacking social skills" stereotype? They can develop "system mastery" of countless board-game rules exceptions, but it's too much to expect them to navigate a social milieu? Well, we're supposedly considering here "the game for non-gamers"!
Actually, I find that sort of thing all over the place in real life too, so no, it's not because of any concepts of gamers in my head. I know a lot of people who can't get such things down. And I know some who do it all too well. I think I'd need the rules to keep them from getting whatever they want with their own personal savoir-faire.
If you really want to engage people who enjoy exploring a social -- or physical (as in old-style dungeon expeditions) -- space, then applying techniques designed to cater to people who prefer to avoid such exploration does not seem like a very good plan.
Heh, I actually find more people who think that's the sort of things we do in our games and find that more unappealing than otherwise.
I swear, somebody one day is going to ask me where we find Steam Tunnels around here...