In the following setup of Stonewall Attack:
[FEN ""]
1. c3 a1null 2. d4 a2null 3. e3 a3null 4. f4 a4null 5. Bd3
Wouldn't that make the king vulnerable to diagonal attacks from a bishop or a queen? If yes, what variation of the opening mymay be used to counter this problem? If no, how? Thanks!