There is also a theory if you do "too much platooning" that the opposing pitcher will get into a rhythm where he can learn how to pitch to the opposite handed hitters well enough and mininize the damage. However, if you stick one or two same handed batters in there, the pitcher has to pitch differently to them and he gets out of his rhythm. In other words, you make the rest of the line-up better, by sacrificing a same handed batter or two. Some preliminary research on this showed that there might be something to it.