I've been experimenting with Chrome's Dev Tools Workspace features. It includes the ability to edit a file directly in Dev Tools and have the saved stylesheet refresh itself (or even compile and then refresh!).
However, as documented in the StackOverflow question "Chrome's “Auto-Reload Generated CSS” not reloading page when SASS recompiles CSS", URL parameters on the stylesheet URL prevent Chrome from noticing the change.
That means that only during development, I wanted to remove the
?ver=X.X.X from the normal stylesheet
<link> output by
wp_enqueue_style(). In other words, I wanted the default
to instead be this: