For context, I'm using NixOS, not Arch, but it's a similar enough idea. I have a tiling/tabbed WM configured just the way I like it, and a window switcher thingy, and it makes juggling hundreds of windows really easy and quick. Combined with a terminal-based editor, a custom setup for my shell, and direnv for easy environment switching, I can be switching between a dozen different projects within a single day (sadly a requirement for my work right now).

Whenever I look at how my colleagues with KDE/Gnome are managing their workflows, it makes me appreciate the work I put into my setup a lot.

Also, I have a whole bunch of shell aliases and scripts for tasks I do often.

Sure, you can configure any distro to do that, but things like Ubuntu or Fedora would get in the way. At some point, when you want to choose (or even write) every component of the system and configure it yourself, it's easier to just build from scratch rather than start with a lot of pre-configured software and remove parts.