i don't think a lack of a bolt thru is a problem for a lighter fixture such as a yardblaster,i've never seen any sagging....however for a fixture such as this 125 with signifigant weight that could be an issue,though im sure this arm right here,as well as the mount are superior to a yardblaster arm..
and old people sag because the gull turds speed up the effects of aging.
Those are older, they may also have had incandescents too.....so incandescents were so much lighter that they didn't use through bolts....
and old people sag because the gull turds speed up the effects of aging.