It's more like boilerplate best practice.  Otherwise you could argue the entire LESS file could be removed from a number of modules because they (currently) don't have any styling in them.

However, every module is eventually going to have its own styling, and it should be using as much shared code as possible (like variables and mixins).  Having the import at the top just makes it easier to use shared styling when it does become styled, and has no impact otherwise on the compiled code.