In the context of a laptop, I am thinking about things like: mounting external drives, power management configuration, network configuration (access to wireless networks), switching keyboard layout (e.g., US, US international), ...
(edit) Context: I did use i3 all by itself before, but always seemed to be missing something. Afterwards I switched to KDE which I do like, but i3 is snappier and a tiling wm is handy on laptops with small screens and/or older hardware.