>While this is true, there are billions of convenient examples everybody knows.

Well, in those days they had a billion less examples than we have today - or at least tens of thousands of common today product categories and things not yet existing.

But they also used weaponry (Zeno on infinite division), chariots (Plato on soul), pots (Plato on art), caves (Plato on reality), dice (Heraclitus on chance), and many other things.

Plus, famous examples tend to be re-invoked (same how computer vision students re-used Lena).