It's obviously subjective easytiger, I would have said that while all the bands you list are
Underground, none of them are Prog. in the true sense of the word. Growing up in London in that era it we considered that there were only a handful of true Prog. groups (not bands) namely: Yes; King Crimson; Genesis (up until L.L.D.O.B) E.L.P. & Germany's Tangerine Dream and Amon Düül II. Groups that were on those fringes were Jethro Tull (esp. T.A.A.B.), Gong, The Moody Blues, The Nice, V.D.G. Generator and Pink Floyd.
Perhaps wrongly, I know amongst my peers, had you asked them to sum up Progressive Rock at that time they would have said: "Rock music based around the principals of Classical music with the emphasis on keyboards rather than guitars".
While I accept that there are plenty of good Neo-Prog Bands around today, the OP's and subsequent suggestions that Roxy Music, Queen; Alice Cooper and even The Mighty Groundhogs were to be found in record store bins marked 'PROG'. can only mean one thing, the store owner was dyslexic or deaf!
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