I clarified with
@Charlaquin a short version of what they do:
They require that the player clearly states what their character is trying to do. In some cases you determine their actions will have no chance of failure, in other cases they will ask for a check.
My short take on this:
I require an appropriate check. People can add description but it doesn't change the target DC, the abilities and training of the PC is what matters. For persuasion and intimidation I prefer speaking in person but need to at least know what they say which can modify the target DC. Otherwise I don't care how they declare their action.
As far as I'm concerned, unless Charlaquin has a correction that's pretty much all I have to add.