What's an unpopular D&D / RPG opinion that you hold and won't concede?

Over on Twitter the OneCritWonder@OneCritWonder asked "What's an unpopular D&D / RPG opinion that you hold and won't concede?".

I thought it was and is a great topic. I replied as follows:

The original way to play was a game of exploration and combat was to be avoided when possible. Murderhobo's should be treated to the angry villager rule. Especially those who specialize in killing innocents.

Enough with the cannot handle more than 3-5 players. With OD&D you can run 12-15 players and on occasion even more, this is no sweat with experienced adult players. I have run 15 players where at least 7 of them were 10-12 years old.

Massive amounts of preparation are not necessary or IMO desirable. At any moment of the day you could tap me on the shoulder and I could sit down and run an 8 hour game with no prep. That is one of the beauties of a homebrew OD&D campaign that you have fully created.

There is no off the map, there are no worries about the players breaking your world and no NPC is untouchable. If the players want to topple a kingdom, go for it. There is no pre-written railroaded script of a story IMC. Story is what is told after the game play has occurred.