The obsession is that centers are the anchor of your defense. The NBA is a PNR league and if you have to play a center that can't guard it - it's VERY harmful to your defense. I've watched Brook Lopez play about 400 times. When he's passable defending the PNR and defending the rim, our defense is solid. When he's bad, it KILLS the Nets. If Okafor has trouble defending the PNR, properly rotating and protecting the rim, or rebounding defensively - it's going to be exploited on a regular basis.
No one is knocking low post offense - it's just that becoming GREAT in the low post is really, really hard nowadays. If he proves he can consistently score on post ups + catch the ball deep in the paint (with how physical and big defenders are - this is a really tough task) - he's going to start dealing with schemes specifically against him. Aggressive fronts, hard/soft double teams, entire teams digging at the ball. You need to not just be able to score but make perfect passes, take care of the ball, and consistently fight for deep position. It's not easy but low post offense isn't dead. LBJ just carried the Cavs through the post. Dwight did plenty of work in the post in the playoffs. So did Blake. So did Timmy, ZBo, etc.
