One reason I don't like to use alternative icon themes most of the time is that they rot easily. If the theme developer does not keep up with the application up

One reason I don't like to use alternative icon themes most of the time is that they rot easily. If the theme developer does not keep up with the application updates it will lack elements. Since themes are usually free or for a single low fee, this will happen probably as soon as the theme developer stops using the application.