You are dealing with the public.
Some guys have no understanding of what is considered normal.
RTF - to me means Receiver ready.. plug in my reciever and go fly.
(It can include a rec, but so many radio choices it's hard to include a rec)

ARTF - can mean all kinds of things, like "add motor" or "add batts"...

Airframe only..... means just that.

Boom common sense.. done deal.