"Some shooters may choose a tube red dot sight like the aimpoint pictured, No magnification, 1x only. Personally I don't see their purpose. A variable illuminated scope with a 1x lower range does much the same. But has a zoom magnification advantage,"

The difference is Parallax and the eye box. With the Aimpoint it is fairly much parallax free, and the shooters eye can be close or 3 feet away. The dot does not have to be in the center of the optic and if the dot is on target, you are on target.

This is not the case with a regular rifle scope even on 1X. The Reflex sight can be used to any distance you like and if you know the hold over you will hit your target if the shooter and rifle are capable. People use to shoot to a 1000yds/mts with open sights so if the shooters eyes are capable why not do it with a reflex sight.

Edit to add. I have one of the longer Aimpoints on my 416Rigby simply because when I bought it there were no rings for the shorter Aimpoints to fit the CZ 550 about and the H1 and H2 were not in exsistance.