Using Thunderbird for RSS

> Thunderbird delivers RSS feed items the same way as email, so you can apply filters to mark them as "read"

This is a good idea. I use Thunderbird only for a small number of feeds I want to read every post from. I used to also use a separate feed reader for my "river of news", but eventually I stopped looking at that and just loadded hackernews or reddit when I wanted a distraction. But I might try Thunderbird for more feeds and just auto-mark most of them as read so I can browse at my leisure.

I like Miniflux becuase it is easy to run and keeps a centralized status if you have multiple devices. I guess if Thunderbird supported the Fever protocol you could use them together unless there is some other method I'm not aware of?

The issue I have with Thunderbird and RSS is that there's no good way to do a show me the unread only and keep the feed folders. You can do a search folder or show unread folders but that affects mail too.

Or I don't know how

This may be a good alternative to the various web-based services, which suffer from various limitations (cost money, display ads, limited number of feeds, limited retention, annoying features you don't want, etc). The email-style user interface is also familiar, and you can set up filters to ignore or star certain stories.

Assuming you don't need syncing across devices, the main drawback to self-hosting is that it only receives updates while your PC is switched on. Some feeds update often enough that you'll miss stories if you don't grab them multiple times per day.