Yes, for finding optium solution to well defined problem with many alternatives choices / variables to consider, commuters designed spiciflically for that problem are already fasters and better than man; However, man is not so limited, but a general problem solver.
Furthermore, man interacts with the environment, and senses it to do so. On doing that, AI machines are decades from reaching first grade level, if not centuries.
When a computer driven machine can solve and do this cup stacking problem repeatedly even 10% as well as humans can - say no errors and not more than 10 times slower, I'll stop laughing at your humans becoming a "pesky nuisance."
https://www.youtube.com/watch?v=H0YgrUKfTcA or more tries at new record and slow motion of it done and side-by-side competitors see:
https://www.youtube.com/watch?annot...&feature=iv&src_vid=3xeFvKz6uh8&v=1RtZFDccTRI And this one, at:
https://www.youtube.com/watch?v=Q7IMT8n0lJM opens with a kid who looks to be no more than four years old -plus about 4 minutes into video - see it done blind folded! (Only tactile and sonic, no visual, interaction with the environment)
All at the world championships - 18 countries and more than 1000 contestants! - An Olympic Sport in 2020?
As a display of human abilities, which I predict no AI machine will match in even 1000 years of progress, cup stacking is right up there with gold metal level ice skating, but yes AI machines can now often walk on level, obstacle-free, ground. Don't sell short what 300,000 years of Darwinian selection has produced.