As the tech founder, if you don't have enough time to work on a core part of the code then you should detach yourself from it all at once. It makes it harder to solely push team forward from a product level if you still care about implementation details.
Over time, I think this kind of should feel like you're having the team chase you out of the codebase. People take ownership of core things, you move to something else, team takes over that, repeat.