No, they have nothing to do with the style of play. They have to do with group dynamics, which is an entirely separate thing.
I actually haven’t ever used them myself. I’ve only played with people I already know or people that those people are vouching for, and I do a solid session zero to establish campaign content and tone. But it’s who I’m playing with and the fact that we’ve discussed it that’s relevant there, not whether we’re playing heroic fantasy romance or dark gritty realism.
In formal English, the comma is just wrong. Informally, I agree it does a very effective job of making the message get across that way.