Earlier quoted context omitted.
> Take Mac away and high quality desktop apps will go away. Well... no. Ubuntu, Gnome, KDE, XFCE; they are all high quality desktops. Don't mix the desktop with the applications you're running on it. > We'll have to endure multi-platform Electron stuff. Now that is indeed a real issue, and yes, ugh. Edit: I've misread the original, sorry, so adding a few things: if you're using the default apps or the ones built for…
I think his point was that the Apple/Mac ethos foster high quality design and attention to detail, which is applied when developers build apps for the Mac.
So much so that most developers using or targeting elementaryOS integrate their design really well.[2] For those that don't but still use GTK3, they also integrate quite well out of the box.