Why not allow teams to ask for replay on check swings in playoffs "How umpire Gabe Morales, Giants' Wilmer Flores viewed controversial final strike call "

Why not allow teams to ask for replay review on check swings in playoffs , at least 1 or 2 ?

 "How umpire Gabe Morales, Giants' Wilmer Flores viewed controversial final strike call "

https://www.sfchronicle.com/sports/giants/article/How-umpire-Gabe-Morales-explained-his-final-16534621.php