I think some bands really shine live and recordings are just sort of documents, unfortunately never got to see them and while I've listened to some of the records I don't often return.
I suspect that they don't get spoken of much because they are coming from the "hippy era" of music which probably makes them less approachable to contemporary noise folks. Obviously a lot of what is worshiped is stories of shows where we can piece together the information with the live recordings we have access too, but a lot of that is informed by our experiences with sound/culture.
It does make sense they found worship in the Japanese scene though, a lot of those performers are more explicit about psychedelic music influence.