I know that the theoretical refutation of
1.d4 d5 2.c4 Nf6?! is supposed to be
3.cxd5 Nxd5 4.Nf3.
Perhaps Black doesn't fear the refutation because he intends a gambit such as
3.cxd5 c6?! or
My question is not about the refutation or the gambits. My question is, what if White declines to capture on
d5, and plays
3.Nf3 or 3.Nc3? Does the game simply transpose into a normal line?
In that case, has Black gained or lost anything because of his funny move order?
If White is not going to play
2...Nf6 have any advantage over normal moves like