I have been using the tool, which I called Artemis, for several months. Every morning, I looked forward to my "morning paper" of blogs I love reading.
There are no notifications, read vs. unread states, counts of posts, etc. Only the last seven days of posts are available. The colour scheme is changeable. Dark mode is supported. All popular feed formats are supported.
There is no reading interface to read blog posts; rather, the links take you to the authors' websites. Many of my favourite bloggers put a lot of effort into the design of their blogs and like to change things up; I wanted an experience that embraced that.
The reader is now available for anyone to use (with invite code "hn").
I built a site around programmatic blogrolls (sites that publish an OPML file of their recommendations using a specific format). I collected a bunch of initial subscription lists[1], which are curated lists, "planets", and web rings. The I spider out from there. The aggregate list is too diverse, and definitely has some low quality content, but connections between blogs are useful for discovery [2].
[1] https://github.com/robalexdev/rss-blogroll-network/blob/main...
[2] https://alexsci.com/rss-blogroll-network/discover/feed-ff6cc...