Comment by linguae
I agree. There have long been macOS-style skins for KDE, GNOME, and other desktop environments, and some of them do a good job at capturing the look of macOS. However, it’s the feel of macOS that makes macOS special. Additionally, it’s the Apple Human Interface Guidelines and the ecosystem of conformant apps on macOS that also contributes to the overall experience.
That’s the core challenge with efforts like ElementaryOS, helloSystem, and ravynOS; it’s not enough to provide a polished desktop if we still have to deal with non-compliant apps.
Of course, this is a challenge even for macOS in an era of Electron apps, and in the Windows ecosystem there’s much less of an emphasis on conformance to UI/UX guidelines.
At least Electron apps populate the menubar under macOS. They do no such thing under Linux even if you’ve got a setup that features a global menubar (as KDE is capable of).