I don't understand why you shouldn't support sass out of the box. Other than maybe the heavy extra dependencies, but if that's a reason, there should be an easy opt-in at least.
Also, relative import paths as the convention..
Makes refactoring folder structures really hard, and you can't avoid that when an app grows. It's so easy with a webpack alias, I'd be happy to know why to not build it into such a project by default. It's not that relative aths would stop working..