Thanks for that! I’m just reading Burning Wheel (again) and yeah, the part that strikes me the most is the Artha cycle. Roleplay -> Artha -> Tests -> Advancement.
I think the author of the article, though, was pointing out things about Burning Wheel that are relatively easy to port to other systems. That tends to leave the stuff that’s less mechanically specific, and more a matter of general design. You could use his three points in dang near any game, but the Artha cycle would be quite a bit more work, if doable at all.