As pop songs are usually given a pretty conservative time limit (2:45 on average and shrinking by the decade), there isn’t usually time for an outro. Intros are becoming increasingly rare as well. On top of that, the chorus (or more commonly referred to nowadays as “the hook”) has become the primary focus of most pop songwriters today.
Originally recorded for a Live-Aid concert, the video was voted one of the worst of all time by an NME survey. I, however, find it hilarious and always get a kick out of it. I’d like to think, based off of how goofy Jagger and Bowie are acting in the video, they were thinking the same thing.