It's right up there with, "we used to shift a ton and it worked great, but then inexplicably we knocked it WAY down for reasons," as the new market inefficiency. Well assuming you're talking about 2016, we were 29th in shifts that year at 4.6%, only ahead of the Marlins, who I'm guessing didn't even teach the concept. Since then we've gone 29th, 28th, and this year we're at 23rd, 14.2%. Astros are somehow at 50% for the year. https://baseballsavant.mlb.com/visuals/team-positioning?teamId=117&venue=home&firstBase=0&shift=1&batSide=&season=2016 We shifted a lot in 2015, did we not? It seems 2016 we just went super defense so it didn’t matter, but as things slipped by the pitching/defense it doesn’t seem like we’ve adapted by trying to shift more, like David said.