GNOME gets out of your way and lets you get on with your work. Customising every last detail isn't necessary to be productive, and if it is a DE isn't for you anyway.
The default settings are very sensible, I only change one or two things myself, most noticably focus follows mouse, which requires a silly gconf tweak and is considered "broken" by the devs.
I'm not too deep into GNOME's architecture, but I don't see that at all.
KDE is the KF5 Frameworks on top of Qt on top of QML and C++. Desktop widgets, panel widgets etc. are all architecturally the same thing, "Plasmoids". Settings screens are all isolated and also architecturally the same thing, "KCMs".
On the other hand, GNOME is GTK on top of GObject on top of C, Vala, JS, Python, Rust and a few other languages still, because they still haven't really decided what they want to go with. The extensions are written in JavaScript, but run in the same process as the entire Shell, meaning that if anything locks up or just takes longer in an extension, then your Shell does the same.
I don't want to argue that GNOME is horrible in this aspect, but in my opinion KDE is better at it.
If I could just get terminal shortcuts like ctrl-w for delete word or Ctrl-m for return to work in Firefox text fields it would be perfect for me.
It does work as expected in Chrom(e|ium) and most other apps. In Chrome you can still close tabs with ctrl-w, you just have tab out of a text box first.
It puts less stress on my right wrist, which suffers RSI a bit and is consistent with terminals on every (unix-like) OS.
On macOS I get this behaviour via Karabiner Elements; on Gnome I mostly get it via Tweaks. Except in Firefox, as mentioned, where I put up with ctrl-backspace and curse.
KDE on the other hand is somewhat fine, if you don't touch anything. Customizing opens hell. UI Inconsistencies, weird bugs, stuff drawn off screen, almost guaranteed... Horrible IMO.
I'm on KDE Neon now, after having used Mint for a while. KDE is simply a joy to use. Everything works, and the visuals are consistent and well-proportioned.
The UI is damn good. Way more polished and consistent than what passes for the three way mess that the Windows 10 UI is these days. Straight out of the box you get a polished, Windows 7 type layout, complete with a start menu better than Windows, consistent fonts and smooth animations. And unlike every other desktop, the dark theme actually works as advertised.
The only time I go back to windows is when is need Corel Draw for my graphics design work. And I immediately feel the difference in polish and consistency. If I could get without Corel Draw, I would definitely banish Windows from my laptop.
That being said, GNOME is a clusterfk. It's what we all accused Windows 8 of beign. A wannabe tablet desktop in a world without any actual tablets. What is possessing them to remove functionality available in ALL other desktops? When this is pointed out they point to extensions written in a leaky javascript implementation, which can be broken the next gnome update because why not?
If you want a modern desktop on Linux, Kde is what you want these days.