I've always wondered why people enjoy tiling window managers. Personally I don't really grasp it. If I work with a lot of papers and documents on a desk, I don't "tile" them, I keep them sort of organically in front of me.
And whatever app I need to use should ideally be straight in front of me. But that's just me, maybe I haven't had a proper tiling experience yet and thus I haven't seen the light.
For me, it's less that I want to "tile" windows, than that I want whichever one I'm using to be fullscreen and distraction-free.
I don't like visual clutter. If I'm using a program, I want it to be the only thing on my monitor. But sometimes I want to keep more than one program open, or even be switching between them. Tiling window managers let me give each program its own full screen, and quickly switch between them with a keyboard command. I love it.
And then there's the exception that proves the rule: Sometimes I do want to have two programs on the same screen, side-by-side. An example would be Vim in the left 2/3rds of my screen (where I am programming), and then a browser with some documentation on the right 1/3rd. Obviously tiling managers also support this case, and I prefer them here too vs. mousing around windows into place (which still tends to leave behind windowing chrome and other visual clutter).
That reminds me of another reason: I prefer keyboard to mouse. I've learned good form and technique for keyboard use, which let me use it frequently and for long periods while avoiding injury. But I just can't figure out a way to use a mouse or trackpad that isn't harmful, were it repeated enough (a vertical mouse goes a long way though).
Tiling managers let me do everything using keyboard (unless the "tiled" programs themselves require mouse), whereas traditional windowing managers pretty much require mouse. I find it both more ergonomic and much faster using the keyboard.
I switched to i3 years ago for the workspace management. I can spread different workspaces across my monitors with easy commands and full control. Every OS and linux distro I've tried has inferior workspace management compared to i3. Tiling is secondary for me.
If you need to work on 2+ apps simultaneously it makes sense, just like if you were copying text from one document to another on your desktop you would put them next to each other.
And whatever app I need to use should ideally be straight in front of me. But that's just me, maybe I haven't had a proper tiling experience yet and thus I haven't seen the light.