I've heard of it, just not popular these days because we have learned and moved on.
Most aas including orals will give results alone...its just not done that way these days because we have learned how to double and triple the results by mix and matching.
Pro hormones are a great example. They work by themselves and some are or were steroids, non test steroids, like Tren Extream. H-drol works by itself and that is just a form of T-bol, which also works alone.
I know a guy that got crazy gains doing a....ready for this? TREN only cycle!
The problem is he couldn't get it up during the cycle and for weeks afterward. So most non test cycles work...just not the best idea.