> it doesn't matter if for minute-to-minute execution right now lots of small functions would be better or worse, you either have them or not; and whatever tradeoffs you make for the code you write during this one ticket, it should take into account the potential future readers.

This is precisely the problem.

The way it should look like is, these trade-offs should be purely local, minute-to-minute editor preferences. Inlining some helpers or removing error types from the code you see, should be no harder than folding a code block or pinning a peeked function definition. Nor should those "changes" have any effect visible to anyone else. You should not take into account any "future readers", because there won't be any - but rather, you should pick a representation you need right this second, and switch to a different one the moment you need that, etc.