Like I maintained during the debate about Instant Replay in football -
Bad calls , as long as we have human beings officiating, are part of the environment of the game - as much as weather, or field condition, or fans in the left-field bleachers with beer bottles...
(BTW, I also rail against domed stadia, given an opening... )
Domed stadia suck.
The designated hitter, OTOH, would work just fine in both leagues.