Subjective

Also known as it takes different strokes to rule the world.

Go to any vendor who sells AR accessories and just look at the variety that's available in pistol grips.

That alone should tell you that gun owners are not a monolithic one size fits all group.

Another area where personal preference hits hard is in re-dot mounting.

How far forward or back you place a red dot is entirely up to how you like things rather than there being a correct way to do it.  Really as long as you can see that damn dot you're golden.  The rest is a matter of how much scope body you want in your view and the ratio of through the tube and not you prefer.  I prefer mine so that the back of the scope is above the trigger, but I have marked my rail for when I am using the Po-Boy and have to place it at the forward limit.

The next thing that surfaces about red-dot mounting is that the scopes and the mounts are very definitely focused on flat-top AR-15s.

Lots of other guns have been adapted to rails; mostly a forearm.

You might notice that the rails begin far forward of where they do on an AR.

What if you prefer a more aft presentation for your red-dot?

[Cue fanfare]

How about mounting that scope in a "backwards" cantilever?

The cantilever mounts for an AR were originally for placing the red-dot farther forward so you had room between the red-dot and the BUIS for a magnifier or night vision scope.  The reason they are cantilevered is because there really weren't railed forearms back then and it needed to be on the upper.

However, it's not strictly a directional item.  It's for mounting the optic past where the rails end.

Even if the rails end to the rear.