Comment by feoren

Engineering is about tradeoffs. There is no One Model To Rule Them All. Your post is a great thing to keep in mind, but it's not a prescription. Engineers need to be able to look at a problem from many points of views at once, and try to find the right path for their current problem. This is why it's so important that models play nicely with one another, something that functional programming is getting better at, but reactive programming still really struggles with.

All of your asterisked points are well-taken, but: do you need that capability? Sometimes; sometimes not.