I.e. you're talking strategy and architecture, I'm talking not even tactics, but individual minute-to-minute execution.
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.
But for the major issues like split between "lots of small functions" vs "one big function" even if the IDE could e.g. inline the functions for readability, but that feels a bit risky as it makes it difficult to talk about the code or document a functions' interface if another person is seeing different semantic structure of the code, it's as if they had different names for the same things.