Yeah, I had Claude spend a lot of time optimizing a JS bundling config (as a quite senior frontend) and it started some things that looked insanely promising, which a newer FE dev would be thrilled about.

I later realized it sped up the metric I'd asked about (build time) at the cost of all users downloading like 100x the amount of JS.

This is what LLMs are good at, generate what "look[s] insanely promising" to us humans