I use it because my window manager manages windows better than any browser manages tabs.

I've noticed most people in my organisation hate the idea of having work chat in a browser tab. They really liked having a separate app.

It doesn't help that the Windows default (not sure about Macintosh) is to group icons in the task bar, so your separate Browser window for chat makes you two-click to switch between browsing and chat.

> (not sure about Macintosh)

The macOS default is to have no taskbar at all, just a bunch of icons without text or context.