Tony Vargas
Legend
That's just not the kind of system D&D is. You can't just add fluff to D&D, you want new fluff, pretty soon you need new crunch to support it. It's just the nature of the system, no mechanic's entirely generic.It's hard for me to say, as I basically want them to release a defined set of new crunch, and then almost entirely fluff for the rest of the life of the game. I like to have a complete ruleset, not an ever growing one.
There are such systems - like Hero - of course. It's cycle is just what you describe. They put out a core rulebook, then supplements that add fluff - genre stuff, mostly - and little or no crunch. Because the crunch is all generic mechanics, it's just a matter of mapping existing mechanics to new fluff.
Wasn't the RC just printed towards the end of the 'two-prong approach' though?(I know, I know, the only way to get that in D&D is with the old Rules Cyclopedia, but we're talking about what we want to see here.)
In that sense you can take up any ed of D&D after the end of it's run, and it'll be crunch-stable.
So, if 5e had been designed with adding more crunch in mind, it could have kept sub-classes fairly setting-generic, and used PrCs for more setting-specific things with such identies, like Oath of the Crown or PDK.Most subclasses, for instance, have actual setting identity for me--they aren't just mechanical tools to represent a character.