On the other hand, I’ve also seen single developers create a tool or dashboard off-the-books that had widespread adoption. Things that would never have breached the top 100 features list since they are entirely internal. The irony is then they are expected to maintain it indefinitely without official effort allocation.

You’re absolutely right, but just to a point. It should be easy to clearly quantify the desired financial outcome of a sprint, but not of its components. I don’t want to spend a single minute figuring out the financial outcome of a single ticket.