I use event tracking on my outbound clicks all the time. My side project is a vertical niche search engine, so I like to know when, where and how people are leaving the site (since that is the point of the app afterall).

I have some of it tracked with internal code, but for a lot of things that don't need rigorous analysis/tracking, firing an outbound click event to GA is sufficient.

If gives you more context around an exit to your site, ie someone didn't just hit back or close their browser, they left your site via a means you provided, and this is where they went