That strikes me as an issue of table conventions (and to me, that seems like a doubtful one).Agreed. That said, I've spoken with more than one DM on here who goes much, much too far in the other direction. Any word that comes out of your mouth is instantly and irrevocably canon. Any declaration, no matter how clearly joking it might be, is instantly (and often ruthlessly) implemented.
Whereas expectations around the declaration of actions - ie saying what it is, in the fiction, that your PC is doing - seem to me to go to processes of play. There is the issue of what counts as sufficient specificity - I'm sympathetic to the idea that, in many typical D&D scenarios, "I smash the vase" is lacking in specificity, given the many ways that D&D characters have to smash things and the many ways D&D makes a big deal out of furniture and architecture. (I wouldn't expect it to be such a big deal in, say, a game of Prince Valiant.)
Otherwise, I think @Charlaquin's posts about reasonable specificity have been sensible enough!