> But did the business need all of that functionality? Rewriting a subset of an application that is far more maintainable and cost effective in the long run can

> But did the business need all of that functionality? Rewriting a subset of an application that is far more maintainable and cost effective in the long run can be a huge win. It was needed enough that the rewrite (which was slow) had to delay release and the legacy software had to be kept alive well past its sunset date (and plenty of people jetted by then.) Because the business had to keep the lights on! The missing functionality at least was said to be missed by the business folks who made use of it. "If only we had feature X" definitely was said. There wasn't anything too beautiful about the Haskell. It was mostly systems work. But incrementally evolving and improving would've definitely be cheaper long term than a rewrite .. but it does require people to learn Haskell, which seems to be a nonstarter for many. If people don't wanna, they don't wanna.