After Plasma 6 dropped, I decided to try it, and it quickly became my favorite Linux experience. Coming from GNOME, I was pleasantly surprised that many GNOME extensions I would rely on had equivalent feature functionality built into KDE (things like a Dock, Clipboard Manager, KWin Scripts, Tiling/Fancy Zones, animation configuration). I can pretty much echo everything said by the blog author here. (EDIT: Not to mention that so many of my GNOME extensions would break in between upgrades, or crash regularly, meanwhile KDE has been rock solid for me these past 9 months).
I still think GNOME is slightly prettier, but KDE is infinitely more usable for me.