Could also be the fear of turning the joke into the good ol' r/DNDMemes regular (AKA people seriously arguing about Rules As Written/Intended instead of laughing at said joke)
Ha. Implying most people don't homebrew the shit out of things.
One of my games, the DM threw in a Spartan Laser. Two instances of "boy that looks scary, I'm gonna laser it!" later, and he was rethinking that decision.