The first Tenchi I ever saw was the first Tenchi Muyo movie:In love on the Sci-fi channel back in the mid 90's.Then a few years later I found the manga they were talking about, it was released by Viz back when they were still a relatively small publisher, and it became one of my favorite series. I would love if Cartoon Network/Toonami would bring back all the Tenchi Muyo animes, and season 3-5 of the original.

Well Rent a girlfriend and Domestic Girlfriend are like soaps operas and soaps have been popular in one form or another almost since TV was invented.

Arifureta and Smartphone are power fantasy where male leads are surrounded by a harem of beautiful and desirable young women, gee why would any straight male want to watch that. The light novels for Smartphone btw are actually better than the anime.

Animations quality asides Seven deadly Sin story is no more repetitive than a Dragon ball story, or for that matter something like Attack on Titan. Fortunately it saved by it's excessive fan service and " questionable characters" whatever that means.

Both super and diama can and are almost certainly canon. Probably different timelines but super itself explained how that's possible during the Goku Black storyline. Super,diama, GT and even Super Dragon Ball Heroes all can still be considered official canon. The only real question is will any future daima sequel follow any of super 's stories but with a few changes or will it go it's own route.