I don't think it's a great idea. But it would be with a focus on AI. A tool that analyzes source code and attempts to give a high-level explanation of how it works would be powerful.
Onboarding as well. Many companies lack proper documentation and the resources to answer complicated questions, so new devs are expected to figure things out. It takes them several months to properly grok how the different modules of some SaaS interact with each other, and their major quirks. Chances are by the time the new dev understands the system, they have made several bad decisions that have made it to production and are not trivially reversible. With a tool that gives a rough description of how things work and what parts of the system are the most vulnerable, the effort would be reduced to proof reading and some manual additions by some experienced team members.
