Thomas Shey
Legend
In general, while I don't like doing so, rules light settingless is a doable thing, and it doesn't seem arbitrary most of the time. For me, it seems like more work in session than I care for, since extrapolating from the fiction isn't intuitive for me, but extrapolating to a task system can be.
I'm not going to say its impossible; but let's just say that experience with system-free roleplaying many years ago has taught me the result is far more hit or miss than I care for. If that's not other people's experience, then obviously they're going to see it differently than I do.
(I do agree that working from a common metric helps considerably in consistency, but I still maintain that it throws detail over to the GM and player in a way I do not expect good outcomes from on any reliable basis, and that's over and above whether the GM in GMed games is going to use the same standard for difficulty from one time to the next. That's not only irritating on a game level, I think its kind of a fiction-fail to boot).