What is relevant is the fact that LaRussa fails to recognize that continually bringing in pitchers for a lefty/lefty matchup (or righty/righty), at best, prevent between 3-10 runs over the course of a 162-game season. Here are the problems with what he does.
1) It requires the team to have a larger than normal bullpen, at the expense of enormous extra cost (since good relievers command a huge premium any more) and also at the expense of having good hitters on the bench
2) By not having those hitters on the bench, it forces the regular players to be used more than they should. With regulars (Edmonds and Rolen, for example) needing time off, there is a huge shortage of players able to step in. This forces the aging few to play every day and also prevents younger guys from getting a good look
3) Not having that offense in the lineup costs the team runs produced, and certainly a lot more runs than the 3-10 that are saved by having a bunch of relievers
4) The games just drag on and become a miserable experience. If I was told I have 24 hours to live, I'd want to watch a game with Tony LaRussa managing since it would seem like an eternity.