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.
Like any piece of machine-learning tech, you’re bound to run into some bugs and kinks. What problems have appeared in beta versions of the tech that have needed to be worked out in further iterations?