One also has to account for why a given player is averse to such things, too. Back in our TORG days, one of my players had no real problem with using Possibilities (which while clearly serving the function of a metacurrency, actually represent something that exists in setting and is known by some people including pretty much all PCs) but found the card play element (also strongly metamechanical) disruptive. This had nothing to do with how in-setting either process was, but simply they could spend Possibilities without disrupting their play process (which was strongly immersive) but the card play pulled them out of it. The former was not more intrusive to them than handling die rolling and other mechanics handling, but the latter was.