I tend to use combat cloak so people think ive left the engagement, plus i macro acid blades so its nice to get a hidden strike going again if backstab (the other ability that procs the acid blades dot) is on cool down. makes sense to me.
I guess it all comes down to personal preference. While yes it is nice to get another acid blade ticking on the target, I personally see it as a slightly 'cheap tactic', similar to when a Shadow/Assassin combat stealths, saps and regens. You may see it differently.
When I was learning the DPS Scoundrel, I avoided using the double opener like the plague, as I didn't want to become reliant on it to kill a target, I still avoid using it today unless the circumstances of the fight escalate quickly out of my control due to more opponents showing up (and I decide I want to take one down with the ship).