we're dreaming up some features in a hosted version of the product which could maintain an up-to-date 'software map' of your codebase, and that is the backbone which would power all diagrams/visualizations
there's a separate problem here re: multiple sources of truth (e.g. Linear for a spec) that you're also getting at. in my own experience, whiteboard is still quite helpful when it's important to understand the change going in (which isn't every single one!).
in the future, we plan to deliver (1) affordances to capture the spec planning process in the whiteboard so you can iterate more flexibly / in more ways, and (2) will also ship a hosted product so this can be multiplayer - which will help resolve that source-of-truth issue, we hope.