Grendel_Khan
Hero
You're right, of course. It is possible. But never underestimate how many 5e players have no interest in learning any other system. There is a gulf between 5e fans and RPG fans.
Yeah but that still doesn't explain why you'd need to compromise your interests. Unless you're trying to run five games a week or drum up support for a game store, just run the thing you actually want to run.