Author’s note: this isn’t an argument against Futures, there’s nothing wrong with them as such! This article is about good abstraction and proper separation of concerns when using them.
The aims of functional programming are much the same as any other discipline of software engineering: modularity, abstraction, low coupling, high cohesion, and so on. While the techniques and terminology are often new to developers, the goals and benefits are expressible in very familiar language — because it’s all software, and we’re trying to achieve the same thing! (Read SICP for more background on software engineering fundamentals expressed with functional ideas).