> Totally sold on LLM written unit tests though, they are a drag to write and I do save time not writing them by hand.

This is where I've landed, but I'm also skeptical of totally relying on them for this.

In my personal experience, it's worked out, but I can also see this resulting in tests that look correct but aren't, especially when the tests require problem domain knowledge.

Bad tests could introduce bugs and waste time in a roundabout way that's similar to just using LLMs for the code itself.