Ha, that's rich. Gave me a laugh. Anyway, that is an Adventure League thing. It's reasonable that for organized (dare I says 'association') play, you would want standard rules so people don't walk into strange situations. I don't see how it would apply to home play. Indeed, from the printed version of the 5.24 DMG, the relavant portion I can find just says this: "You oversee how the group uses the game's rules, making sure the rules server the group's fun." House rules have been a de facto part of home games forever. Otherwise, they are taking the old school bit a bit too far in channeling Gary's "“house rules” poker" speech.This is an "explicit rule" too.