> How will LLMs "do it for you" if you don't tell them what you want / need?

You tell them what you want, yes. You just won't need to be a software engineer to do it.

  > shipping fast isn't the same thing as shipping what is good, neccessary, helpful, or profitable

LLMs will warn you if something isn't good, helpful, or profitable, etc.

  > But shipping more and / or faster is not the solution. I'm not even sure what the problem it's trying to solve would be.

There are plenty of ideas in the world to implement. Current software development is slow and expensive. That's a real problem, and LLMs are helping solve it.