While I shudder to use "realistic" in any discussion of a wargame ;), I think there is a difference in realistic-to-gamey spectrum between the 1-hex shoot & scoot and the multi-hex shoot & scoot.
1-hex S&S - In this a unit moves to a hex with LOS to the target, fires 1 or more times, then moves one hex back the way it came out of LOS. Because of the LOS limitations of a hex-based game, this tactic to me is a decent representation of a unit, say a TD platoon, moving up to a ridge, peeking over to take a shot and moving back behind the ridge before the enemy can fire back. That was standard tactics for many nations/armies.
multihex S&S - This is when a fast unit dashes across multiple hexes in full LOS to the enemy (often to take advantage of armor facing), fires, then retreats multiple hexes again (all in LOS to the enemy) to get back out of LOS before the end of turn. It's a little harder to visualize a real-life analog to this situation on the battlefield. I'm not saying there aren't isolated cases of similar things happening, and I've probably read about a couple of them myself, but it's a little too Hollywood for me to consider a "tactic", i.e. the bold hero maneuvers his tank gallantly out into the field of fire, incredibly dodging incoming fire, to boldy kill the enemy's command tank, then ducking back into cover at the last possible moment.........every six minutes. Oh, and all his buddies in the company do it too.