Earlier quoted context omitted.
https://formulae.brew.sh/formula/mupdf#default
Thank you! Not sure how it is supposed to look like on other OSes, but this is barely a GUI application on macOS. (I have to launch it from the command line, UI and text rendering are extremely pixelated etc.) It's definitely not up to par with any PDF viewer I've used so far, especially when it comes to quickly navigating between pages and chapters (crucial for non-linearly working with scientific papers etc).
Ah. Well, that's how I use it on Debian because I'm terminally addicted, but I find the rendering satisfactory. IIRC it doesn't automatically reload from disk when the document changes, for that I use Evince.
The Android version is a bit more than that however, it has a simple file browser, and I settled on it because it handles large files better than whatever alternatives I went through at the time.