Thats funny
Wasn't really meant to be funny (or insulting, etc
).
Might still be applicable even if you're a firearms instructor, too.
The last couple of guys with whom I worked using their M&P's included a firearms instructor/armorer and a fellow who's not exactly an inexperienced shooter.
Both wanted to carry M&P's (FS, compact & Shield) as authorized duty & off-duty weapons ... which meant that aftermarket parts which had gone into at least a couple of their guns for use as range/target guns wouldn't be authorized.
After the guns were restored to factory spec condition, I spent some time out on the firing line with them (different range sessions & times).
After refocusing the attention of both on the basics & fundamentals, getting them off relying upon distracting things like a 1-2 lbs difference in trigger press, "trigger reset", etc, I pushed them to participate in increasingly difficult and demanding drills. Grip technique, positioning, balance, sight alignment/picture/indexing and proper trigger recovery became their focus. 1 & 2-handed, point shoulder, close comb at/retention, shooting-while-moving & shooting-between-moving, etc.
Both of them experienced a marked increase in being able to better utilize their existing skills and abilities, getting their attention back to the basics. Both expressed surprise that they couldn't "feel' the weight or smoothness of their trigger press while actually involved in running drills and making critical decisions (identifying threat/no-threat targets and determining how to best engage them).
Now, if we were talking about going up against some grandmasters in a competitive venue, where skillsets were already highly developed and hundredths or thousandths of a second might mean the difference between winning (scoring), then I'd certainly see the practicality of having a highly refined competition gun that was a "10 out of 10" when it came to manufacturing tolerances, fit, trigger job, etc.
For the rest of us, though?
Let's just say that I no longer worry about having a trigger pull on any of my 1911's that's at (or below) the factory spec weight for either of the manufacturers (Colt & S&W). I'm content, as an owner, user and armorer for the 1911, to have trigger pulls running 5-6+ lbs in my "working" 1911's.
I've seen guys shoot M&P's with all the aftermarket parts, and watch them not shoot themmas well as other guys using stock guns.
When it comes down to it, if you "improve" a particular gun, you may only be able to shoot
that particular gun well.
However, if you "improve" yourself, those skills can be applied to any gun.
Just depends what you want out of things.
. Oh well, I guess its time for an Apex sear! 
