I think a good part of it is that the "old" stats are nearly universally understood by fans, and not just what they are and represent, but the scale of performance. For example, if you tell a fan someone is batting .200, they know that hitter's not good. They know .300 is good, and .400 is incredible. They know 100 RBI's is a benchmark number, just like 20 wins for a pitcher, and a 3.00 ERA. Most casual fans wouldn't be able to tell you what a good FIP is, or what a batter's OPS should be, or if a player's UZR is acceptable. To a previous poster's point, if the causal fan becomes more sophisticated, and starts consuming, understanding, and demanding advanced stats, MLB teams will ensure they find a more prominent place in broadcasts. Until then, get used to hearing about how the gold glove should go to whoever has the fewest errors (which by the way, isn't a terrible stat. The Orioles would've been better off yesterday with Paredes and Machado not getting to those balls--the fact that they did, and altered where the ball ended up, is why Esco scored, and is a story UZR or DRS wouldn't have told).