to further the point, when you EDIT styles in the browser, you are always working on the generated file. Editing styles in the browser is WAY more common than editing HTML in the browser, and because the tools with which you edit the CSS in the browser generate CSS, it becomes much more tedious, ironically, to do a lot of CSS work, then convert to Sass.
Perhaps it's just the way I work, but generally if I'm adjusting CSS in the browser, I'm previewing how some potential changes will work. I already know what the affected class is (since I'm editing it inline), and I've already targeted the CSS I'm about to modify, so once I'm done previewing it's a simple matter to go back to the Sass and change things around.
