I adore the fact that I can sign PDFs so easily from the system-default viewer (and save my signature for next time)

Also love that I can do all the image-editing basics from the same app (enough to make memes anyway...)

Though it does concern me a bit that most of the best UX features in Apple software are older; usually the newer an Apple UI is, the worse it is. Control Center and such are pretty nice I guess, but Apple Music on macOS is terrible