Why is the g3 and Bg2 set up so strong vs the Dutch? Why is the g3 and Bg2 plan so strong vs the Dutch? For example, in other main openings (KID, Gruenfeld, Queen's Gambit, Queen's Indian) it's just an alternative to the "classical" systems, those with no early Kingside fianchetto. A strong one maybe, but an alternative. In the Dutch, it seems that if White wants to get an advantage in the opening he can do it only with this set up. Nf3, g3 and Bg2.
The g3 and Bg2 setup is strong defensively and strong offensively. White wants to play e4 to challenge the f5 pawn and Black's kingside white square complex. g3 and Bg2 is one of the best ways to support e4 with Nd2/c3 and Qc2 along with defending the king.