I think he would have been all over AI, and would have pushed Siri ahead instead of letting the product stagnate. I suspect he'd have pushed into robotics as well, especially home automation robots. Home automation in general, in fact.

His whole thing was being the smartest, most tasteful, and most creative person in the room. There was a lot of illusion/delusion there, but even with his failures he was absolutely focused on product design, user experience, and aesthetics in a way that Cook's Apple isn't.

Cook's Apple is a hugely successful predatory and cynical cash extraction bureaucracy, with a world-leading hardware division and a shockingly mediocre and failing software division.

The goal is penny-pinching acquisition, so we can expect more and more of this from Apple until there's a change of leadership. (If we're lucky...)