The thing is, you’re probably wrong.
MLB isn’t watered down. If anything the talent pool is much, much deeper than it was just 20 years ago.
The influx of indoor stadiums available to high schoolers plus many high schools adding indoor batting cages has prolonged the amount of practice. Add to it the meteoric rise in the number of travel leagues - which, thanks to said indoor stadiums, are available year round to players growing up, and the talent pool escalates. And even at high school ages, these kids are learning how to optimize exit velocity and launch angle, and even engaging in training to increase pitching velocity. (Source:Lou Merloni during yesterdays game.)
Plus the international growth of the sport and some changes to the Japanese posting system has allowed the best players from other countries more ready access to MLB. Some 20 countries or so are now represented in MLB, and I’m not sure of the exact number.
All of this to fill a talent pool that only fits 780 players.
MLB isn’t watered down.