Yeah OpenCASCADE is amazing because it's the only real geometry kernel that's open source. There's a few smaller ones like solvespace, but they're really more like toys. It's like the Linux of the CAD world.
Writing a geometry kernel is a monumental task, not unlike writing a real os kernel or a modern web engine. I've seen people just lay the basic foundations of a kernel as their PhD thesis. Most of the commercial ones were written decades ago and are still being worked on - the big ones are Parasolid ACIS, ShapeManager, CGM. The last one would maybe be considered a newcomer cause it's only 15-20 years old.
Because a bunch of professors defined it like that 70 years ago, before the AI winter set in. Why is that so hard to grasp? Not everything is a conspiracy.
I had a class at uni called AI, and no one thought we were gonna be learning how to make thinking machines. In fact, compared to most of the stuff we did learn to make then, modern AI looks godlike.
Honestly you all sound like the people that snidely complain how it's called "global warming" when it's freezing outside.