Mr. Sakurai responded the following on the issue:
The idea of Brawl's 'carefree brawling' motto was to get rid of as many restraints as possible and allow people to choose whatever play approach they liked. I'd like people to take some freer approaches with their gameplay, but the sort of battle style you describe in your letter is not interesting or fun. That's why I'll probably be thinking of a way to deal with that in the next game. We've learned a lot about net play since Brawl was released, after all, so a lot more is possible.
It would have been nice if we could have revised the game rules as appropriate, but with the system we had, that wasn't possible.
God Bless and Play Hard Gamers!