With miniflux I have not limits with unread items/feeds. I can set check frequency to what I want and I actually don't need the app as the www ui is just brillinat!
Something atypical about my setup is that I wired up miniflux webhooks to n8n and gotify so that when I click "save" on an entry, I get a notification for it. It's a rudimentary way to setup a "read it later" list.
the UI is an acquired taste i think, it has a very retro feel to it. i was mainly using it because it let you make nested folders of feeds
they also have an android app and its available in the fdroid store as well if you are into that kind of thing
i personally like the newsblur UI btw, i was just repeating what ive seen other people saying!