I'm pretty sure SNL only got as far as season 5 for its full season releases. I know the big challenge there is all the little jingles at the start of sketches they have to pay royalties for. And also, season 6 is the beginning of the series' absolute worst stretch. I'm surprised they didn't jump ahead to 1986 though, the start of the Phil Hartman/Dana Carvey cast.
By season 8 ('82-'83) the show was widely regarded as having come back to form and Eddie Murphy had become a major star. Season 10 ('84-'85), after Murphy's and Joe Piscopo's departure, was the one-year cast with already-established performers (Billy Crystal, Martin Short, Christopher Guest, Harry Shearer, Rich Hall) and was also well-received. Plenty of good stuff in those years.
What those seasons didn't have, though, was Lorne Michaels, and perhaps not coincidentally have gotten short shrift in reruns and compilations. When the '80s seasons were available for streaming, they weren't full shows, just selected sketches, and no musical guests, so they weren't paying for music clearances like they did with the first five seasons. Which is too bad, because even in the worst times there were musical performances worth seeing, even in Michaels's abysmal '85-'86 comeback season (I'm thinking of Johnny Cash, Tom Petty, The Kinks, Fear, Cheap Trick, Lindsey Buckingham, Captain Beefheart, The Go-Gos, Rick James, The Clash, Squeeze, Big Country, Adam Ant, The Fixx, Madness, George Thorogood, Parliament-Funkadelic, Frankie Goes to Hollywood, the Cult, the Replacements, Stevie Ray Vaughan, Rosanne Cash, others I will remember later...).