All sports have changed.
The NFL has altered rules for years to make things more beneficial to the quarterback to promote offense. And when defenders started getting better, they made even more rules to allow receivers to have better opportunities to get open.
The NBA, nobody shoots long two's hardly anymore. It's just 3's or in the paint. But it's also insane that players have adjusted tot he 3 point line. Someone like Curry is regularly shooting like 10 feet behind the 3 point line, which was unheard of 20 years ago.
We've talked night and day about how MLB has changed.
But even in other sports, athletes all around are just stronger and more talented and athletic. In tennis, serve and volley isn't a thing anymore. It's a combination of the tour slowing down the game by slowing down the surfaces, and also with modern equipment/strings, but physically, every tennis pro, and even collegiate tennis players, are way more athletic and physically more fit than McEnroe or Connors back in the 80's. Serve MPH average has gone up, groundstroke MPH has gone up.
We're seeing this everywhere. This just isn't a baseball problem.