Winning championships seems like a somewhat useless stat for baseball players

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While championships are important for team records,
individual records don't really care about the number of titles won.
Baseball is a sport where you can become a legend even without a championship.
In soccer, where 11 players compete, championships are extremely important,
but in baseball, with 9 players, championships aren't a major focus for a player's career.
Postseason stats don't even get factored into a player's career profile.
Playing hard during the regular season
and then slacking off or playing it safe during the postseason
seems to be the most efficient way for a baseball player.
No matter how badly you mess up your postseason stats,
as long as you do well in the regular season, you're set.