The context is that I've been transitioning a Mac user over to Linux recently. But here's the twist: the UI in Debian's KDE Plasma desktop is also much easier to use than the Mac OS desktop interfaces.
E.g. Discover is great for Linux novices running KDE: https://apps.kde.org/discover/ - I've tested this with non-technical people and they can install software easily, without needing my help.
KDE Plasma is great. That's what I always advise Linux novices. Very intuitive, especially with Windows users.