To be fair, @Justin seems to be talking primarily about taking a project you already have a mental model for (presumably an imperative model) and translating it into FP from the start. Making changes in a primarily data based system that focuses on transformations is potentially something that he agrees completely with. I think you’re talking about two different scenarios.
On top of that everyone has a different level of familiarity with FP and this obviously will impact how well you find analogs to things you’ve already done before.
