Most uses of LLMs for development that I've seen are for writing code, when the majority of dev time is spent reading code. What offerings exist to read through an existing codebase and ask questions of it? Do contemporary LLMs have enough lookbehind for that?

We are years from way from the average user being able to replace X SaaS tool with available open source software they run themselves.

Even now, the average person could have GPT walk them through replacing WIX with their own self hosted website. When I say "dev," I probably misspoke. I meant more in the sense that the average person will be able to implement existing software in a way that was previously unreachable.