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The ideal trigger pull for defensive applications is anywhere from 4lbs to 6lbs (according to sources such as Dave Spaulding, Kyle Lamb). Anything greater than 6lbs is too considered too heavy to accurately control. The caveat is that this suggested ideal range (4-6lbs) is for the average shooter. There are certainly expert shooters out there who can shoot anything.

I have two Gen 4 G19s. I have shot countless rounds through them with OEM triggers without any polishing (25cent glock trigger polish). My first shots were usually accurate but some of my follow up shots inevitably went astray due to poor trigger control. The snap or break in the Glock triggers was very abrupt and contributed to my poor trigger control and muzzle shift. I have been to several handgun courses and the trigger control issues really show when rapid firing multiple shots during the training.
Yes, if I practiced more then perhaps this could be overcome but so far it has not despite going to the range weekly and dry firing daily.

I then installed the Travis Haley Skimmer Trigger. This Skimmer Trigger was supposed to reduce overtravel and make the trigger more like a 1911 with short reset. I tried it and eventually removed it because the snap when breaking the shot was still too abrupt.

Finally I installed the Ghost Evo Elite connector and it has completely transformed my follow up shot accuracy. The 3.5lb connector was installed with a heavier firing spring (6lb), which made the trigger weight overall to be 4.8 or so. It feels a lot lighter, however because it is so smooth. I chose the Evo elite over the other offerings from Ghost Inc because it not only took care of the overtravel but also eliminated the snap and abruptness of the shot. My trigger pull is now one smooth motion. On the range the benefits are very clear. Even with rapid shots I stay on target and can deliver consistently combat accurate hits.

I have met some LEOs and have read from Massad Ayoob who advises to not modify the OEM trigger at all. Their rationale is that an overzealous prosecutor may charge you for negligent discharge if your trigger is too light. I can see their point if the trigger pull is less than 4 lbs but between 4-6, I think it would be more difficult of a case. That is the reason I chose the 3.5 lb connector but with a heavier firing spring.

All I know is that with the OEM trigger, the potential of aberrant hits was higher and the potential of missing your target in a high adrenaline defensive situation was greater. Again, it was not the pull weight but the abrupt snap or break that disturbed my trigger control. I want to ensure as much as possible that my shots hit my target and that an innocent bystander was not injured or killed. I would rather be charged with negligent discharge on my attacker than to miss my attacker and fail to stop the threat and or hit someone innocent.

The Evo Elite addresses the snap and made the entire trigger press smooth and predictable. I have no financial interest by the way in the company.

Sorry this was long winded but these are my thoughts.