I do. They are any mechanics that place any constraint on the GM that you are not already comfortable with via play of D&D or similarly structured games. You don't have a problem with a GM deciding to add in a forge during play in response to a play query. You have a problem when the system constrains the GM's authority to author things, so long as that restraint is not one you are already comfortable with.
I mean, if we really want to go places where the player "edits" things in perfectly acceptable ways, we just have to look to spells in 5e, but that's going to be met with the tired and uncritical "but magic." Combat is another place where the GM is constrained in their authority over outcomes, but that, again, get's ignored through the uncritical claims of 'that's different, the character has the ability to swing a sword!' while ignoring that characters also have the ability to remember things. It's very obvious what you mean, it's just that the reasons you mean it are arbitrary and uncritical.
I know, I made the same arguments.