So you can agree with me that it's possible for people to not use their sights as well if that's how they're trained, right?
No, not in every situation.
At very close range, yes, but when the distance is longer or precision is needed, no.
And yes I know there are master competition shots who don't use their sights but that's a master who has practiced for years and hundreds of thousands of rounds.
Crawl before you walk, walk before you run, run before doing flips...
So you learn the basics first, index and trigger control. And the easiest index is sighted fire.