FrozenNorth
Hero
I think that framing the question in that manner is inherently adopting a “trad” framing of the question.Reading your post, I wondered if you had considered that putting a rule in force for oneself isn't a binary (i.e. it's not that it's either in force or not in force.) I observe participants putting rules in force for themselves with variations in strength.
Can the group of players (including the DM) agree that they want the DM to have broad powers in running the campaign? Absolutely!
Can the group of players (including the DM) go a step further and decide that they are OK with the DM not being constrained with the written rules of the game if the end result is fun and exciting? Also yes.
Except, that wasn’t the framing. Your post is framed as the DM putting a rule in place for themself.
To me, this heartens back to the framing that the game is the DM’s game. They can exercise more power because they put in the most effort. The players must defer to the DM or leave the game. A poster can indicate that they derive enjoyment from providing a game that is fun to their players, but this must be immediately and vociferously qualified by adding that their fun is paramount.
So to answer your question, no, because the DM does not put rules in place for themself. The group (including the DM) decides how much power the DM can exercise.
It means that when someone thinks DM should be free to unilaterally modify the rules, they could have in mind that DM will exercise discretion. Some rules, DM might be reluctant to modify; others they might modify more freely. And that can apply to circumstances of play too, so that they might feel it is less well justified to modify a rule in some circumstances, and more in others.