Again, it’s subjective. The last time I used KDE it felt hacked together and inconsistent, and I got exactly the opposite impression of GTK and GNOME. I thought KDE4 was good but KDE5 looking like a knockoff Windows complete with context menu hell just isn’t for me. It’s much more developed now, but in my own testing I find a lot more inconsistency from KDE and Qt stylings in general, and I prefer to not have to touch my machine once it’s setup and I really find GNOME’s workflow to be best for me.
This is the endless argument, though. I like the way GNOME works by default, so the configurability is irrelevant. Some people want configurability, which is fair, but after 9 years I just don’t care anymore.