Interesting essay looking at how systems evolve their schemas over time. We're generally ill-equipped to deal with it and this presents options and ideas to that effect. Of course, the more precise you want to be the more complexity you'll have to deal with.

Clearly not a style which works for any and every applications. Still, it's definitely a good thing to aim towards such an architecture. It brings really nice properties in terms of testability and safety.

Functional programming is made scary due to its jargon. But it doesn't have to be this way.