The World Blitz Championships is now played at the standard time control of 3 +2 second increment. If you are playing over the board, it's best to play with an increment.
Most tournament players don't play with an increment when playing online though, for the very good reason that it's a bit more difficult to cheat when there's no increment.
So, there's a very good practical reason to play with no increment in fast online games, but that reason is removed when playing over the board.
As we all know what Optimissed is saying is nonsense, I suggest just ignoring it. Intentional trolls do exist, and there's no point arguing anyway either way.