[marmakoide]

I had the same experience with computational geometry.

Very good at giving a textbook answer ("give a Python/ Numpy function that returns the Voronoi diagram of set of 2d points").

Now, I ask for the Laguerre diagram, a variation that is not mentioned in textbooks, but very useful in practice. I can spend a lot of time spoon-feeding the answer, I just have the bullshiting student answers.

I tried other problems like numerical approximation, physics simulation, same experience.

I don't get the hype. Maybe it's good at giving variations of glue code ie. Stack Overflow meet autocomplete ? As a search tool it's bad because it's so confidently incorrect, you may be fooled by bad answers.