Perhaps this is because (I think) voting used to be public, so there was an expectation for -1’s to identify themselves and provide some reasoning for their negative vote? It’s a lot easier now to just vote “no” for any reason - my own promotion received a single “no” vote, and I still have no idea who cast it… or, more frustratingly, why they cast it, since I only got positive comments on the poll.
…which, by the way, is part of the reason why I’m glad that a single -1 is no longer treated as a veto. 
Welcome to the team, @kumaraditya303! Prove the five wrong. 