Thanks for the example, always good to hear about some real-world experience with this stuff. I'm curious if you think that the rewriting of the system itself also helped improve the situation, as I've found that oftentimes if I rewrite something, I'm able to use what I learned from working on the original iteration to design things a bit more effectively. Not saying that if the initial implementation had been in Python it wouldn't have been better than the Scala one, just curious how much of a difference you think that made.
Certainly there’s a lot of credit due to “lessons learned” - but they key part is that the main lesson learned was to prioritize spot change flexibility over a “pluggable” model of extensibility enforced with a type system design and rigidity. Any smaller scale tactical improvements in code structure paled in comparison to that core property.
