Earlier quoted context omitted.
I've never used IINA, but I'm wondering why you don't just use mpv on Linux? I've been using mpv for years and I've never had any issues with it.
IINA is much more than mpv. Sure, it uses mpv underneath, but the selling point of IINA is a well thought out UI with just enough features but not too many (totally subjective, of course)
That's exactly how I would describe the default mpv UI :)