I don't think 2.d3 it deserves (!) and certainly not ! Just because Magnus Carlsen thrashed a GM with it 8 years ago, does not mean that it is that brilliant, and whilst I agree it is a valid and good try for an advantage (which White should try for in any opening), I disagree that it is White's clear cut best - he has other good options.
Also, after 2...Nc6, databases actually prefer Black (only just looked this up), although of course this is by no means more than an indicator. There is definitely more to be discovered in this line.
Right, time to redress the balance in favour of the Dutch:
1) After 1.d4 f5 2.Nc3 Nf6 3.Bg5 correct is 3...d5 where you can waste a tempo with Bf4 at some point or play the far more popular 4.Bxf6 exf6 5.e3 and the game will be slow and positional.
2)1.Nf3 f5 2.d3!? is interesting; I would play 2...Nc6 where Kindermann recommends 3.d4! and claims the tempo loss is less significant than the awkward knight positioning, although I am not so sure.
3) The Stonewall rocks .