"If you spend multiple turns raising your defenses and you're unable to one-shot the opponent, then the opponent gets a lot of time to cripple your boosted Pokemon using status moves like swords dance, nasty plot, toxic, roar, or whirlwind."
So, +6 defense isn't worth it if an opponent were to destroy it outright? Let's say that Smeargle baton passed to a Pokémon with +6 defense, it isn't sufficient enough to stall?
So, I guess I should worry about speed?