And how often does even 6 happen ? Once in every dozen games, I'd guess.
NO! Don't mess with baseball, the game is perfect as it is. (Well, except for that Designated Hitter, thing)
What would you do when somebody hits the limit?
Strikeout?
That would not be baseball.
But he never reached 21.
I could be wrong but in the early days of baseball, you WERE called out if you kept intentionally hitting fouls.
Think about how many rules have changed over the years.
At one time, umpires sat behind home plate in a rocking chair.
A batter could call for a high pitch or a low pitch.
Catchers were considered "sissies" if they wore gloves.
Designated hitters? Get out of here.
Even old timers would have NEVER allowed that.
Hell, they would have been upset by the concept of a "relief pitcher".