Not sure I get what you're saying about revolvers being more accurate than semis. I've personally had different experiences and seen a lot of stuff on my range that lead me to believe that's just not the case.. more so when you're talking about firing in double action, which you have to include as it's the first round that goes out normally. IDK.. YMMV greatly on the subject I guess.
in the case of nypd they have a choice between continuing to use a revolver or going to a glock with a ny trigger. the average shooter thinks it is a no-brainer, but they have never had to use a ny-trigger.
a revolver in double action is typically 12 lbs pull over a long stroke. it is predictable and consistent. the ny-trigger is actively detrimental when compared to civilian trigger glocks.
the ny-trigger takeup to disengage the firing pin safety is normal but once you get past that the poundage jumps to 9 lbs with no real feel or feedback and you still arent even close to the sear disengage. as you get thru to the final 98% of the trigger stroke you still dont feel the resistance of the striker or the sear trip, so it is just a weird friction and not a mechanical actuation.. the 4 lb civilian trigger uses a tiny bit of mechanical advantage in the trigger pivoting to push the sear past the trip point. the ny trigger part jams a plastic bit that fits in around the sear/drawbar connection area to create mechanical disadvantage. so you have to overcome the natural striker spring resistance and the resistance of the ny part. and the feel is squishy, like you are bending the plastic so it isnt predictable.
we were issued sig226s, but at my academy there were some guys who opted to use their own glocks which the dept armorer installed ny triggers on. these were relatively experienced shooters and you could see them struggling to shoot accurately. everyone else was getting 9 and 10 ring groups with the sigs in sa, while the glock shooters were just barely keeping 10-11 inch groups on the silhouette targets. one of the guys complained up a storm every chance he got, I didnt understand until later when I switched to my glock23 for my off duty gun to reduce some of the weight I was carrying around. after trying to qualify with the ny-trigger, the difference was jarring. and this was with the 9 lb ny trigger. the nypd used the 12 pound at that time.
civilian stock glocks are dead easy to shoot and be accurate. a ny trigger glock leaves you squeezing the trigger with all your might while trying to be smooth and keep the sight picture. you could watch the glock guys at the academy forearms straining and shaking while trying to shoot. [and they were big guys with plenty of upper body strength]. the best analogy i have is to stick a ball point pen behind a gun trigger such that to fire you have to crush the pen first before you can get the trigger past the actuation point.
for duty, if you have a choice between a revolver and a ny-glock, the glock isnt the natural choice. the mod makes the gun so much harder to shoot that it is difficult to have any confidence in being precisely accurate. while adrenaline may help in overcoming some of those trigger issues, if you have other options I would certainly consider them.
furthermore, in shoot/no shoot scenarios a 12 lb double action trigger is a very comforting thing to have, especially when you are holster drawing or clearing a building in the dark with your gun at the low ready.