The idea of a rifle/carbine with a usable sighting system is not strange at all. My eyes - as the rest of me - are old enough to make iron sights difficult unless I am wearing my shooting or reading glasses. So a low magnification scope or red dot [sort of arrangement] makes a 'short range' (125 yards or less) long gun very usable.
I cannot see putting a 3x9 - or bigger - variable scope on something like a .30-30 or 7.62x39 caliber rifle/carbine. Likewise, a .30-06 with a red dot arrangement is odd in my mind; UNLESS one is hunting big game in an area where shots over 100 yards are rare to non-existent.
And - I cannot consider putting a cheap ".22 scope" on a good .22 long rifle caliber rifle. One doesn't need a 500 yard scope, obviously, but one desires a good image and sight picture to the range of the caliber.