Works fine for us for glueing a bunch of CI steps together which would've been a pile of bash otherwise. Works well with depot.dev caches. We don't use it for anything AI either.

No, it's code based CI/CD not a build system.

I use it to do builds in our monorepo. We got onboard before the LLM trash features. The base design is ok but there's things I'd do different today if I knew the build stuff would fade away for the LLM push.