FrogReaver
The most respectful and polite poster ever
I think we each consider what counts as 5e to start and stop in different places.The game doesn't stay 5e when WotC adds something new, but change away from 5e and become a new game when someone else adds the same thing. If the game is overwhelmingly 5e, but adds some new stuff, like A5e does, it's still 5e. It's not a new game.
I think official Wotc content vs non-official makes as fine a criteria as any.