If mechanics are not a limit on play, then why did so many D&D players claim otherwise about 4e? Or why do we need more mechanical support for D&D 5e? (And to be clear here: we need not limit ourselves to just 4e in a hobby rife of such examples.)And, yes, D&D can do anything, just as Traveller or Story Teller can do anything. Mechanics are not a limit on play.