It was nice to see this fangraphs article about the influence of spin on batted balls: https://blogs.fangraphs.com/the-lurking-influence-of-batted-ball-spin/
Changes to the baseball obviously have an influence on offense, but I'm afraid many pundits and fans are taking statcast data at face value and extrapolating to all sorts of conspiracy theories.
MLB's opaqueness is a big problem, but I would argue the humidors are a step in the right direction in terms of controlling for differences between locations. Other factors will never be controlled for, which is part of what makes baseball fun.