I'm a KDE user who is currently on his second stint using a Mac - the last was in 2017. I'm trying to be as objective as possible, but my list of "it works better on Linux" is far longer than the "it works better on Mac" list. I'd love to know your arguments.

KDE’s spacing, fonts, margins, iconography and lack of consistency is painful to look at. Gnome is far outpacing KDE in that regard

Could you elaborate? I see no glaring typography problems on KDE (while there are quite a few on macOS, IMO). Iconography – IDK, fairly consistent on the default theme, but it is a bit of a peculiar look.

Aestheticly to each his own. Maybe I'm used to KDE aesthetics. But KDE-on-Linux far outshines the Mac for window management, copy-paste via highlight, Always-on-top, mobile phone integration (KDE connect), keyboard control, accessibility (especially Sticky Keys), keyboard language switching options, click handling in background windows, proper readline support in bash and zsh, integration with third party software such as Emacs (I practically live in Org mode), proper handling of multiple users on a single machine, and so many other things that I just can't think of right now.

Ugly doesn't matter as long as it works better (and I heavily disagree on all of the things you stated.)

I respect your viewpoint, I think it's entirely reasonable. I just happen to care about these things a little more.

I’m gonna need a more detailed argument than that.

It isn’t really a worthwhile argument. Linux has so many window managers, whatever somebody likes about MacOS there’s one that does it better.

One thing I really like about macOS is the shortcuts. You can fairly easily get 90% there on KDE, though. The last 10% is tricky regardless of the WM you choose: some apps just don’t want you to mess with the shortsuts in this way (looking at you, Mozilla).

Apart from that, honestly? With global menu, KDE is nearly indistinguishable from how I use macOS.

Started with kde2, then openbox (2000s), then i3 (2010s), these days I got so used to gnome, anything else feels like a downgrade. So probably it is just what you're used to.