I've started to use Python type hints, but even with typing I like to label my names things that describe local concerns (types are often more general than what you mean to say), and sometimes I'll deliberately shorten the names to make a Python lambda fit where in another language with bracketing I'd just take an extra 1-2 lines and format the line differently.

I've written snippets or data structures one way or another as I'm sure many have, and in my experience the results have been mixed. This and the fact that reduce has no bearing on your app architecture, I do see this as arguing over a small and vague gain or loss.