Completely agree and I feel this every day. Half of my job is split between a functional language on the backend and a class-based language on the frontend. I

Completely agree and I feel this every day. Half of my job is split between a functional language on the backend and a class-based language on the frontend. I have made a conscious effort to avoid shared state, but it's harder. For example, the friction of cloning objects before passing them around. Or dealing with sort APIs that sort in place. I'm going against the language defaults while with the FP language, it feels natural.