you seem to be implying past progress implies unlimited future progress which seems a very dubious claim. we hit all kinds of plateaus and theoretical limits all the time in human history.
Given history, it's infinitely more dubious to link our future safety to some idea of progress stopping for some reason. We'll have increasingly smart AI and your go-to position is that progress will...stop? It's literally helping us with thinking, which is the driver of innovation and progress.
Very few things have slowed down over decades or centuries. If anything it's been a mad rush with AI recently. Of course there will be plateaus, but I specifically put in a time of 100-1000 years in there which is basically very many 9's guaranteed to produce some major fucking changes in the world. 1000 years ago we were using arrows, and now we have AI to help us overcome plateaus.
It's still very much possible that intelligence as we understand it is fundamentally limited. That is, it's possible that the smartest possible being is not that much smarter than a human, just like the speed of matter and energy is limited to c.
Of course, it's also very much possible that it's not: we don't have any good evidence either way.
Might well be true. But the advantage is still the ability to focus on a task indefinitely with no physiological impact, and clone a mind, and communicate between thousands of collaborators instantly with basically no lag or bandwidth limitations compared to typing into a text box.