Is it safe to remove an entry from package.use (in profiles) if the
package has an IUSE default for the respective flag?

To be more concrete, Emacs ebuilds have IUSE="+xpm" now, but we still
have an entry "app-editors/emacs xpm" in profiles/base/package.use
which I would like to remove. As I understand it, the two methods are
adjacent in USE ordering, so nothing should change for users?

Ulrich