Homepage is great. I like that you get little snippets from the apps it links through but is more customisable than something like Heimdall which does similar. It’s become my go-to having tried pretty much every other dashboard out there over the years.
Plex can be set to auto delete. You can set it to delete after something has been watched (after a delay if you want), or to keep a pre-set number of items (e.g. only keep the five latest episodes of show X) or a combination.
Just make sure you set up the *arrs to not re-download the thing that Plex auto deletes.
I’m a hoarder so I keep a lot, but anything that’s time-sensitive like current affairs shows, I delete after watch and set to only keep the latest three episodes.