Comment by PezzaDev

You made me realise that term "dumb code" isn't exactly what I mean. I want to advocate writing code that is very easy to statically understand. You should be able to look a piece of code without needing to read too much around it to understand what it is doing. One of the best ways of doing this in my experience is keeping things simple (or "dumb" as I put it earlier). Using simple abstractions, keeping code organised and avoiding global state also help in this regard.