I had discovered this recently too and asked a relevant StackOverflow question about how people deal with lots of I/O. https://softwareengineering.stackexchang

I had discovered this recently too and asked a relevant StackOverflow question about how people deal with lots of I/O. https://softwareengineering.stackexchange.com/questions/416073/functional-architecture-with-lots-of-i-o/416105?noredirect=1#comment919330_416105 https://softwareengineering.stackexchange.com/questions/4160... The premise is the imperative shell can become pretty riddled with decisions if your application contains a lot of I/O. Some like the "Free Monad" solution, but I found that too be too coupling.