When using "Hide Read", the app behaves normally for a couple of pages, then abruptly pops this screen and removes all navigation and UI from the app until it's restarted.
I figured that about the filter, which I would personally love the ability to control the sensitivity of (some days at work are pretty boring). The UI issue was what I was wanting to bring attention to. I browse /all a lot, so I have a ton of sub blocks.