But on my desktop with two 27" monitors, I find tiling incredibly useful. It's really nice to be able to quickly arrange a mix of Emacs windows, browsers and random other programs to use all that space. If I need to closely read through some documentation while also looking at code, I can quickly open a browser next to the code window. Later, when I want to focus on just code, I can send the browser to the other monitor or to a different workspace altogether. And I can juggle "side" stuff (chat windows, OBS, music, whatever) just as easily.
The key thing is that XMonad with some lightly customized layouts gives me the operations to do all of this quickly without needing to think about it. It only takes a couple of keystrokes to get to the state that I want at any time and, after a pretty short time, those keystrokes became muscle memory. Using a mouse to drag things around is more intuitive and flexible, but it requires shifting my attention far more than just using a single keyboard command. (And thanks to ADHD, that kind of distraction can be a real drag on my mental energy!)