There are also countless individuals who are actually qualified instructors (a YouTube account isn't a qualification) who constantly point out that this is false, and that rather any decent amount of solid training and practice will develop the capability to use the sights when necessary. "You won't see your sights in a gunfight" is a false firearms myth/urban legend similar to "you don't have to aim a shotgun" and ".45 is a one-hit stopper."
Normalizing sub-par performance by calling it unavoidable, when it's perfectly avoidable through proper instruction and practice, is the wrong choice. As you point out, it's a training issue.
OK Erich, sometime next week as you're walking along the sidewalk, a guy is going to come up to you unexpectedly, and push you hard at the shoulder. As you step back 2-3 feet he's going to pull out a gun, point it at your face and (demand your wallet) tells you he's going to kill you.
Now, you need to pull your weapon, get a 2 handed grip, raise it into an isosceles stance (as you've been trained) and find your front sight, line it up with the rear and take aim at your target.
When he sees your gun come off your hip in your strong hand, do you think he's going to wait for you to finish?
I don't know, I'd probably pull and attempt to shot from the hip and continue shooting while I brought my firearm up to get a better sight picture. Hopefully, the first couple from the hip hit, but at the very least freak him out enough to turn and run.
But, you can ask him to wait if you prefer.
Give me a second now while I duck and cover for the impending discussion