As far as I know, the steam engine didn't replace anything that used to require human thought. A mechanical loom isn't replacing human intelligence either. Yes, it replaced a human performing an action, but humans brains weren't exactly racked with figuring out how to sew or weave.

Think about the word "artificial" and the word "intelligence". If it used to take a human thinking and reasoning about something to perform a task but now a computer is doing it, that is by its very definition, "artificial intelligence". A steam engine or mechanical loom don't replace human brains, they replace human hands. Which is why I said "cognitive load".