I just hope Fast.ai adopts some kind of style guide for Swift at least. Python version of fast.ai is an unreadable mess, and it doesn't need to be.
By the way, Jeremy Howard spends several minutes on one of his videos explaining the style and why despite seeming strange it is the right choice for fast.ai. I just can't remember which video, but I would guess it is in dl 2 2019 first video.