@karlo You could definitely do it that way, as well. Personally I think this method of “editing” a theme function should be a last resort only. I think any time that you could modify the hooks and hook in your own function, this is a more organized way of tackling these issues, moving forward with updates.
@Martin Similar to the last example, you could do the exact same thing with the
jumpstart_css function found in /includes/theme-functions.php. — This is where style.css is currently enqueued.