Built for 9g? Maybe the A Model, but only when/if cleared.
Of course more g is good for ground avoidance, but the main reasons for manoeuvre are ACM and to reduce the effectiveness of incoming missiles at longer range - remember the old F Pol manoeuvre? The more g available, the greater and faster the vector change at greater speeds = greater manoeuvre demanded by the missile's guidance laws = greater energy bleed.
Back to the ACM question, given the F-35's relatively poor Vmax and acceleration, there will always remain the probability that an enemy will continue to close their range as an engagement matures. In the case of the B Model doing its defence of the fleet, continual "crank and pump" stops becoming an option against a raid at some point. After that, you either kill them all BVR or stand and fight. Until someone invents an AAM with a 100% Pk, no one can say ACM is obsolete. You may decide you don't WANT to do it (understandable if you're in a B Model), but that doesn't mean it's not possible that you'll end up doing it.