The rules of the game lay out who gets to say what. The DM describes the environment (e.g. "There's a vase..."). The players describe what they want to do (e.g. "I smash the vase with my bare hands..."). The DM narrates the result (e.g. "The vase cracks and falls to pieces..."), sometimes calling for a roll of some kind.
If the group wants to blur the lines such that the DM gets to describe what the character does, they can, but that comes with the potential for conflict that was already identified and discussed for, in my view, no particular gain. I get nothing by doing it except the possibility of conflict. That doesn't seem like a good trade to me.
