I also suspect that chemistry has taken a step forward in developing steroids and masking agents that are undetectable.
That last time a homerun surge happened in baseball, chemicals were involved. To me, that seems the obvious answer to explain the surge this time.
I don't see them turning a blind eye to PEDs all of a sudden given prevalence of testing and past deep tarnishment on the sport from the 90s.
Our local MLB announcers were commenting that when players are called up to our team, their power numbers are almost always going up and that pitchers tell them the seams are lower. IMO, it's some combo of balls, PEDs, and the players all growing up in cages worried about their launch angle and exit velo.
Was wondering if any of the minor leagues are using the exact same baseballs and if so whether there's been any change in their HR counts.