Sufficient if all else were equal. But the human brain and artificial neural networks are clearly not equal. This is setting aside the whole question of whether we hope to equal human performance or exceed it.
That doesn't matter. It's not like we use 100% of our brain capacity for driving.
In fact, that's why radio/music/podcasts thrive. Because we're bored when we drive. We have conversations, etc. We daydream.
As long as the skills relevant to actually driving are on parity with humans, the rest doesn't matter.
In fact, in a recent podcast, Musk mused that you actually may have a limit of how smart you want a vehicle model to be, because what if IT starts to get bored? What will it do? I found that to be an interesting (and amusing) thought exercise.
