This is good thread,and I agree with the premise of the original post,as can be evidenced by a portion of my sig line
I agree that some personal minor modifications to a particular firearm are sometimes beneficial,even if it just for the sake of more comfort as I believe brownie may have mentioned.
However,gizmos(and we all know what they are) is something that I am personally dead set against for my own use.
If someone else wants them,ok by me. For instance ,if you look back at the old gunfights and the old gunfighters,as typified by Mr. Bryce in one of Brownie's stickies,you'll see that those fights were won handily without any such gizmos that we see available today.
I know that there are legitimate improvements in certain areas,but much of this stuff is selling the latest and greatest to people who think they will not be acceptable as "operators" without them. I have a few minor mods to some of my hardware,mostly just consisting of smoothing of some of the revolver actions,but everything else is bone stock,and I'm not bad with a gun. If you have to use a pickup piece,you really need to know how,because it will not have the whiz bang stuff on it that you may like.
As has been stated,continued training and practice is what builds skills that will save you,and there are some trainers right here on this forum that can help to get you there. Besides all that,it's a lot more satisfying and fun to become really skilled with a bone stock gun.