I'm going to say (as I have said before, and I will undoubtedly say again) that muscle memory plays a huge part in the process.
I mostly carry and shoot 1911s. I do my own trigger jobs, and pretty much all of my pistols (other than a couple of mil-surp Sistemas that I haven't touched because I have no intention of ever carrying them) are set to between 4-1/2 and 5 pounds, and I've pretty much eliminated creep and grit.
Yesterday at the range, I tried a new commander-size pistol they have there. The trigger pull weight as measured on a scale is just about 6 pounds, with some creep and a fair amount of grittiness. And I found that it was impossible for me to shoot it accurately. "Combat" accuracy at 25 feet was no problem but target accuracy at 75 feet was not going to happen.
I found that when shooting off a rest for accuracy, the difference between my 4-1/2-pound triggers and this 6-pound trigger seemed mu greater than it is. At times I felt like I was pulling/pressing the trigger with all my strength and nothing was happening. It didn't help that there was a bit of a catch mid-way through the creep portion of the release. I could feel the sear start to move, then it would stop and I had to increase the pressure still more to get it to release.
Cleaning all that up would take 15 minutes or less, but to me it just emphasizes the role that muscle memory plays. I've shot other guns at the shop (1911s) that came from the factory with 3- or 3-1/2-pound triggers, and I had trouble shooting them accurately, too ... because the gun would go off before my muscle memory expected it to. The light triggers are easier to adapt to, because they're clean. The heavy, gritty, creepy trigger is (IMHO) almost impossible to adapt to. It's less noticeable when shooting offhand at a silhouette, but very noticeable shooting off a rest for accuracy.