All this "old wisdom" would do is test how similar the tested gun is to the gun that the tester used to develop their current index.
"Pointing" is a characteristic of the
shooter, not the gun.
I'm sure a CZ would "point" better for me than a Glock because I have a well developed index with Tanfoglios. CZ's are similar, so they would "point well" for me - or, more accurately, my current index would end up aligning the gun's sights pretty close to correctly without conscious attention. Glocks, with their different grip angle and other erogs, wouldn't.
Does that mean Glocks don't "point well"? No, it means
I don't
currently have a good index with a Glock. With a few thousand dry fire reps, I could trade my Tanfo'/CZ index in for a Glock index. But then I'd be stuck shooting Glocks, so no thanks.