The use of `class` for things that should be simple free functions
As a Python programmer, I've found that since I started using `mypy` I've written a lot more classes - I generally like using multiple small functions, but classes have two big benefits for me:<p>1. I don't have to repeat / import type signatures as much<p>2. I can collapse a bunch of related functions more easily in my editor.<p>So functional programming (in python at least!) has a few things to solve regarding ergonomics for me to return to it.