Overseerr has been a game changer for my Plex/jellyfin which I share with 10+ friends and family. They submit tons of requests and it all automatically shows up on my nas without me needing to be bothered. I used to only download what I wanted and only take special requests and only for movies or completed series because I didn't want to be harassed every week for the latest episode. Now my recently aired row is a constant stream of new episodes aired that week and I get friends saying "oh I didn't know you had series x, now I don't need that streaming service" - it's not obvious to them still that I can get almost anything if they reauest it and overseer makes it so frictionless.

I know this is a bit late for a reply, but sonarr and radarr allow you to set specific requirements it must meet as well as things you'd like it to have. In my case, I've told not to get anything 4k or above (no 4k displays so why bother) or less than 720p and to prefer h265 since they are always a lot smaller files. It will even replace h264 copies if a new h265 comes out. It does great at finding nice looking copies in a small file.

Understandable. I haven't had any of those problems, even though I only use some free torrent trackers. Unpopular stuff (local shows that aren't in English for example) can sometimes take a while, so I'm thinking of subscribing to some paid usenet indexer.

Download. I have fast internet so I don't really care about streaming + I like to archive rewatch worthy shows. An entire season of a show takes only a couple minutes, then it's accessible on my plex server.