> I don't think there's anything out there that a computer can do but humans can't do per se.

The first thing that comes to mind is complex calculations that need to happen within a certain time budget to be useful. Like, sure, I could "play GTA 5" by sending each of my inputs to a room full of mathematicians frantically doing calculations who then instruct artists how to paint the next frame to send back to me[0], but even if you could somehow get that to run at 1 frame per day, I'd argue that's not really "playing GTA 5" anymore (a core aspect of the game is reacting to things in real time). For a more tangible scenario, imagine trying to pilot a quadcopter by manually controlling each actuator individually (there's no way you could do that quickly/accurately enough to avoid crashing).

[0]: Also this is arguably still "a computer", just one with an unconventional architecture.