In the position below White continues with e4 after, say, Black castles. grunfeld-defense:
[FEN ""] [StartPly "10"] 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6.Qxc4
Question: How about e3 instead? Is there an outright refutation, or is it just stylistic choice?
I know a couple of QGD lines where after years of practice, people have started to try apparently less aggressive strategies, say by playing e3 and planning for a future e4 rather than an immediate e4 (which makes the game more dynamic and allows quick counterplay). The results have been better with the "slow" moves.
A follow-up: Does the inclusion of Bf4 and then e3 change the evaluation?