Because SAS triangle identity proofs are relatable and I'm trying to make a point...?
That would be like saying Shakespeare isn’t creative , since grade school grammar doesn’t feel creative
On some level, I think the most straightforwardly creative work in maths comes from building up useful generalizations; I can't see current LLMs inventing even something as straight forward as a manifold from first principles; but I also don't think that's fundamentally required to prove useful things, I think it's more of a shortcut for humans.
The space of mathematical statements is infinite. Having the taste, insight, and creativity to reach points in that space that are meaningful to humans is the entire game