19 ( +1 | -1 ) BirdYea, it's the Bird. I've started using it, especially with fianchetto of queen's bishop. You do have to be careful with a loose king side, tho. It's like a Dutch. So why not with a move in hand?
23 ( +1 | -1 ) Because black have to play d5......where's it's not a dutch! Black can play the famous From Gambit where if white doesn't know a long forced line then black get's very nice compensation!
136 ( +1 | -1 ) Mostly because it doesn't work so well overall. 1. f4 d5 is basically the Dutch Defense in reverse, but the problem is that the Dutch is a highly reactive system. By around the fourth or fifth move, you've basically burned your bridges by showing your opponent exactly what you're going to do; the main tries are a kingside attack (either with the light-bishop on e2 or g2) or a b3, Bb2 type of thing as in the Nimzo-Larsen attack). This loss of flexilibity basically allows Black to set up an appropriate defense to meet your idea which works out okay because kingside attacks with 1. f4 usually comes relatively slowly. Playing the regular Dutch with 1. d4 f5 is much better for the side pushing the f-pawn because now White has to commit to a plan, and the f-pawn pusher can react appropriately, either with a kingside attack or with some sort of queenside play (as in the Leningrad Dutch, for instance). So having the extra move actually hurts in a way, since after 1. f4 d5, it'll be White that is forced to commit to a definite plan first by virtue of having the extra move.
Still, 1. f4 does indeed give decent kingside attacking chances for White, especially against opponents that may not be familiar with Dutch systems and don't understand why White is shuffling all those pieces behind the lines.