15/ Speaking of architecture, the big flaw with FCIS, as far as I've seen, is that it basically ignores infrastructure, and things that depend on infrastructure.
"I test it manually," Gary Bernhardt says in his very much worth watching video: https://www.destroyallsoftware.com/screencasts/catalog/functional-core-imperative-shell
That's a choice. I'm going to show you how to make a different one.
(Not trying to dunk on FCIS here. I like it. A-Frame Architecture has a lot in common with FCIS, but has more to say about infrastructure.)
www.destroyallsoftware.com
Functional Core, Imperative Shell