Why does it seem like urf doesnt have a spot in rotation?

I think once per rotation would be often enough for most people

it drastically increases Que times for Standard SR.

Because URF is meant to be special, just like how we don't have Christmas coming around many times a year. I would like to see URF more too but URF would just become boring and lose its uniqueness if it was released too often; I'm just grateful it isn't restricted to April Fool's anymorem