Comment by vkazanov

It took me about 15 years (out of 20 in the industry) to arrive at similar ideas. Interestingly, I heard all the arguments many times before but somewhat obscured by the way function programming speaks of things.

For the purpose of this game spliting things into core/shell makes certain things super easy: saving and restoring state, undo, debugging, testing, etc.

And one more bit, relevant to this new reality we find outselves in. Having a bunch of pure functions merged into a very focused DSL makes it easy to extend the systems through LLMs: a description of well-understood inputs and outputs fits into limited context windows.

By the way.

It is true that dedicated languages never arrived but FCIS is not a language feature, it's more like a architectural paradigm.

So who cares?