Ovinomancer
No flips for you!
Disagree.That's what I thought. So it's simply one's preferences for heavier rules and less referee authority couched in a snide dismissal of the reverse preference, i.e. rules light games and referee authority-based play.
Mother May I is a game where one person has total authority over the actions of the other players. It's not about rules, it's about authority. An RPG that has strong MMI tendencies will be one that has the authority to dictate outcomes entirely centered in one person, typically the GM. A game that has less will have structures that divert outcome authority to system. A game that has very little will have all of the authority for outcomes placed in system, typically in a way that says which participant gets to narrate the outcome and/or how they're allowed to do so. When looking at MMI, you're really looking at the authority structure within the game. This isn't really a claim that a game is bad, or doesn't work. 5e is a game that has a high amount of MMI because the GM is afforded the clear authority to narrate outcomes without reference to the system, and even when using the system has the authority to ignore/alter it how they wish. However, a table can have a social contract that adds restrictions to this authority above and beyond and you can have a game of 5e that is less MMI.
There are very light rules systems that are very low on MMI. There are very heavy systems that are high in MMI. Weight of rules isn't a good guide. Looking at how authorities are structured in the game is a better approach.