Personally, my issue with KDE is bugs. It seems I always have little things that are broken, freezing, crashing, or dying of neglect. My issue with most Linux distributions in general is a severe lack of polish. With macOS, I have experienced a handful of show stopping bugs since around '02. With Linux this is somewhat constant. I can usually iron them out within a day or two, but that is time and effort spent on something that isn't exactly "fun" to do.
As already mentioned in the comments, I will take any OS other than Windows 10/11, but my preferences are macOS and Intel's Clear Linux. If Clear would work on non-Intel hardware in a full featured way (that is, with support for AMD's virtualization) or on M1 at all, I would likely use both every day. As it is, I just use macOS. It more or less works.
Additionally, I love that people will hate on macOS for lacking features and therefore requiring helper programs but will at the same praise GNOME Shell which requires even more.