Topps wasn’t going to acknowledge what led to them trying out some new things in their own magazine, but I think we all know the end of the Topps monopoly and competition from Donruss and Fleer drove the innovation.
Nevertheless, Pearlman’s article in Edition 9, The Winter 1992 release of Topps Magazine, provides a nice overview of some unique ’80s releases. In the comments, let me know which one’s your favorite.