When you tried an AI starter kit, what did it not solve that you thought it would?

Building LaunchAI, and I keep coming back to one thing: most AI boilerplates nail the infrastructure (auth, gateway, RAG, agents) and then you still have two problems nobody warned you about. the app looks like a prototype, and you can't tell what a single customer actually costs you.

Curious whether that matches other people's experience. if you've used a starter kit or rolled your own, what was the thing you assumed would be handled that you ended up building yourself anyway? trying to make sure i'm solving the real gap, not the obvious one.

We go live here Aug 1, a follow helps a solo founder, but mostly i want to hear where the kits let you down.