Sometimes as a module developer you need to have some code execute periodically, like maybe every day or even once a week. This might be to optimise an external system, or pull in some external data or to compute some statistics every day etc.
Livereload is one the coolest things to happen to frontend development in the last little while, and actually it can really speed up your work. Basically it re-loads your CSS (and Javascript some of the time) automatically as you make changes.