You’re right that multiclassing an optional rule, but in practice, I think nearly every player assume it’s in use unless the DM says otherwise (and they will likely complain if the DM says otherwise). So I’d bet that if a ruleset basedo n 5e disabled multiclassing, people would either complain about it, or ignore that part and then complain when it breaks the game.
You’re right that multiclassing an optional rule, but in practice, I think nearly every player assume it’s in use unless the DM says otherwise (and they will likely complain if the DM says otherwise). So I’d bet that if a ruleset basedo n 5e disabled multiclassing, people would either complain about it, or ignore that part and then complain when it breaks the game.