I seem to recall Lennon's "Instant Karma" phase, where he wanted to just get stuff out. Had a song idea, recorded, mixed, shipped out to pressing and was for sale in stores within 10 days.
I suspect a lot of artists over the years have just itched to get something out today, but yeah... without the tech, it was just impossible.
James Brown had that vertical integration once he hit his stride in the 1960’s.
It wasn’t uncommon for him to take the band in for a late night studio session (after a 3 hr show). The song would be recorded and mixed on the fly. Then a copy would be sent to his vinyl pressing plant, which could turn the physical copies around in a day. At the same time, the radio stations he owned in the Augusta GA, area would start playing the latest cut. Just in time for it to hit stores and be available for purchase.
I suspect a lot of artists over the years have just itched to get something out today, but yeah... without the tech, it was just impossible.