I agree …. If anything it would have hindered the AoP even more. The buildings left standing were much more useful anyways. There are multiple instances (Warren's brigade in particular) where regiments used the shelter of buildings to hide from Confederate artillery…..Either Alfred Davenport or Tom Southwick…both of the 5th NY (sorry I know I'm citing them ALOT here!) cited Confederate Minnie balls wounding men in the ranks….the 5th remained east of the mill race
A Confederate

….. let me go back and get the exact wording of the account for you (give me an hour or so) (but it only talks about the wounding of his friend…so don't to get to excited over it)….. rebel sharpshooters are certainly present, especially in the opening attacks…..the men of Kimball's brigade mention the sharpshooters frequently…and enemy skirmishers.. the 5th NY accounts are much later in the day so I would need to examine if any of those dispositions changed.