I saw Gong, but was too young for Soft Machine concerts, but knew their music.
We had a friend who worked for Virgin and often got to hear up and coming stuff at his house... he was taking the tracks around the radio companies and trying to gain air play.
I think that we are blessed (as old fogeys!) in these musicians were exploring new boundaries, new instruments, new electronics and themes in away that was not possible before or since.
I doubt that any of the modern bands, and the manufactured bands will ever have a a legacy as strong or as marked as Daevid Allen, and others of his ilk