They handle the downloading, extraction, categorising and naming of the media you want and they can do that automatically.
I’m good with handling this manually, or rather, I don’t even have to handle any of this since Stremio takes care of it, and I have neither the hard drive space nor the bandwidth to devote toward allowing a bunch of programs to just start downloading large files perpetually in the background, filling up my hard drive and taking up all my bandwidth lol. The .arr suite is best combined with a seedbox and a dedicated computer. All I have is a 1.5 TB hard drive and no gigabit internet speeds.
And honestly, I don’t see what appreciable amount of “time and effort” this is going to save for me. With Stremio, it’s as easy as going into the catalog (or using the search bar), clicking a movie, and picking one of the releases from the menu. If I wanna watch a show or movie that isn’t out yet or whose upcoming season is yet to be released, I can just add it to my library and turn on notifications.
It doesn’t get any easier than that, doesn’t require a massive hassle with a set-up process involving several different programs and trial and error, and I don’t have to devote hard drive space for every show or movie I want to watch, since Stremio keeps files on a temporary cache that gets deleted at regular intervals, so it doesn’t end up filling my hard drive. This system is perfect for me, I have no reason to change it.