as much but in a mixed offense or a running offense it absolutely matters. Part of the 40 timing incluses the burst of speed off the line (if "burst of speed" can be used to describe a linemen). This is especially vital if you need to seal the edge or block a LB. Also is vital when a lineman pulls for a block on the other side of the line.
I have been very disappointed with our offensive linemen for the past 8 to 10 years. We seem to have lost the skill and agility of linemen who played for Roger French.