[analyst74]

In fact, the only difficult part is "human level intelligence", and part of the reason it's hard is that we keep raising the bar.

Being able to talk really fast, or talk to thousands of people simultaneously is not technically challenging.

[TillE]

Hypothetically, if strong AI requires something like a full simulation of a human brain, then those are certainly practical concerns. Of course, one single, slow implementation would be quite impressive on its own.

I don't think the bar has been raised, not since the Turing test was formulated and popularized. The criteria are pretty clear.