TDC most of what you write these days makes sense ( albeit repetitive) but the logic to this statement eludes me. If the guys have more trigger time on a 1911 than a Glock I would expect them not to be able to shoot the Glock as well. Too, if the Glock is a crappy pistol as you unintentionally suggest why would you be surprised to see shooters shooting an apparently better pistol..... better.
Personally I don't care for the Luger angle of the grip that Glocks have. It causes the gun to naturally point high or is it low? The few times I shoot a Glock always causes me to rethink the adjustment I have to make to bring the gun to target. You Glock users learn to do it automatically. I run either my GP-100 or a M&P/CZ most of the time so learning a Glock fundamental isn't necessary.
Glocks are great guns and when applied to their original intended use are outstanding at filling the need for a relatively inexpensive firearm for police and military units in their stock form. The gun was a game changer for Law Enforcement and their budgets. That said I don't buy my guns to kill people or to defend my life (who needs the legal bills and the jail time), I buy them for recreation, playing IDPA and IPSC. At my age I do alright with a body that is something less than new out of the box and no amount of training is going to offset the miles underneath my feet. So what I find interesting in your thinking is you apply your value systems to all others as if they are truisms that will out last the 10 Commandments.
Improving how a mechanical device works in order to use the device in an activity the gun was not designed for may have nothing to do with poor or good fundamentals either lacking or achieved. The cheap polymer sights on the Glock 17 work well enough in a police environment where accuracy standards are relatively low but high enough for the expected use the firearms are likely to encounter or what the taxpayers are prepared to fund. They work ok for shooting at tan targets for some but for others not so well and can be changed out without much expense. No crutch just an improvement in a mechanical device for a changed intended use. So to trigger springs and other sundry parts.
Lastly I marvel at what some here can achieve with their stock guns. I do so. primarily because I know I would never have been driven to achieve that skill level, assuming I had the physical attributes to allow it all to happen. That said, I used to golf with a 3 handicap and I doubt there is a poster on this thread who could claim the same....and it took a hell of a lot of work to get there I might add. My point being, anyone can achieve a peak level, for them, if they are driven to do so in any activity they choose. Few however, are inclined to do, or have the time or funds, so anything they feel will make the shooting experience more pleasant, including lightning their triggers or adding different sights may have nothing to do with the fundamentals of shooting,.... what ever they happen to be today. It may be because they can....and do.
From my experience, I have no doubt anyone who can make a Glock shoot well can shoot almost anything else... well.
Take Care
Bob