Lots of things irk me about macOS UX. Finder's lack of tree view sidebar really irks me. Having to disable the silly animations and sounds when I get a new machine irks me. The absolutely terrible window tiling system irks me. When I minimize a window, I can no longer tab into it. The settings dialog's weird behavior with respect to resizing on both axes irks me. Can't use 3 monitors without an expensive DisplayLink dock and the secondary monitors end up with limited refresh rate options. Meanwhile, I can just plug just about any dock into my 5 year old Windows laptop and multiple monitors just work. Still can't find anything as good as IrfanView (as old and dated as it is, it made working with image libraries a breeze).
Finder and the poor external monitor support somehow irks me the most because now I end up typing into the CLI 90% of the time because the navigation experience is so bad and for me this is a work machine and the difficulty in using 3+ monitors is silly.
I get being an Apple Stan (love the hardware), but the software UX is 100% bottom of the barrel stuff. Basic OS stuff like Explorer is just light years ahead of Finder.