Back from vacation. Hope nobody missed me.
A D1 women's official I know from CA called it a "staccato" whistle. He had no issues with it. Basically felt it was helpful for selling certain calls, either 50/50 fouls or unexpected ones. He didn't advocate it for every call, just some. Officials are generally given some latitude to develop their own style points, and I think this is merely an extension of that.
Anyway, aside from a purist or two, he's never been criticized for it. Seems to me it's widely accepted now as an extra-manual practice. So I guess I don't feel like it's a bad habit in need of breaking as some have posted.