Or even a million years ago.
If we ever invent a time machine I doubt we'd learn much from humans of 10,000 years ago. There would be some surprises for historians and archaeologists, but we certainly wouldn't treat them as cultural or technological equals.
So the horizon of interest where an encounter would be fascinating and worth the time and effort but not devastatingly disruptive to either side is probably only a few millennia.
But let's call it +/- 10k years, to be generous.
Compare with the age of the universe, or even of the galaxy. It's really not a big proportion of the available time.
That's only your opinion, and it's most probably wrong. These guys were capable of feats you can only dream of. And you could be very surprised at their level of sophistication, which might appear higher than us on many levels - if not on all levels.
The ruins we find around the world from previous civilisations tell us they were very smart.
Generally speaking, about once a year, archeologists find something that completely challenges their theories on human evolution.
https://www.livescience.com/biggest-archaeology-discoveries-...
Just the amount of engineering the Egyptians did is enough to warrant our continued fascination with their culture, some 5,000 years later.
Seeing the insane complexity of the human condition (look at the amount of scientific disciplines we come up with) and thinking "nay, this won't be interesting to a higher mind" feels awfully dismissive.
sure, depending on the leap of sophistication we may appear like... rocks, I guess? But I can't even begin to conceptualize to what in comparison we'd appear like rocks. Anything of that complexity probably is multiple magnitudes beyond our comprehension anyway, and therefore not really part of the discussion