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Lasers are not without their advantages. Sure a laser can limit the potential holster choices if that laser is affixed to the rail, but if it is the Crimson Trace style that is integrated into the grip of the pistol this is hardly limiting the holster selection. Even with a laser that attaches to the rail of a pistol I can find plenty of custom holsters on the market.
Secondly, the laser dot aids in the practice of firing from the hip, which is a likely scenario in the event an aggressor surprises you and is in very close proximity. It also aids in low light scenarios where conventional sights may not be readily acquired.
That dot can also be used to keep your noggin and other vital body parts behind cover. If you are taking cover behind an object you can use the laser dot to aim without lining your head up behind the gun and exposing it. This would enable you to use small hole/reflection/gap in cover to aim the gun while exposing only your hand.
Lastly, even with a laser sight device attached to a CCW the primary sights are still the ones built onto the gun. If batteries die, finish the firefight and either replace the batteries or chunk the laser to reduce weight (TEOTWAWKI).