Correct. I'm not sure how that changes the fact that todays state of the art is tomorrows obsolete. Do you see any evidence that advancements will become negligible? The fact that there aren't any memory/attention/feedback systems in place suggests there's some pretty interesting "low hanging" fruit still up there.

We’ll let’s see if purely intellectual machines are indeed useful.

I think many of us are paid exactly for being close to “purely intellectual”. White collar and all. Personally, the physical aspect of my job is trending towards 0, unless you count the twitching of my fingers and the pain in my back from sitting for so long.