What I would give for people to approach documentation in a more empathetic way; tell me what something is for, what problem it solves vs other competing solutions such as X or Y, whether it's still the best solution or in maintenance mode because another tool has become dominant.
Give me the tools to construct my own pros and cons matrix, without assuming that I'm an expert. Put five minutes into asking yourself "what questions are people likely to have, even if they aren't sure exactly what to ask" and write that down.
I'll never understand how someone can spend months or years of free time building something, but then actively sabotage it by not making it easy for people to realize that they've found what they are looking for.
It's also really valuable to keep perspective on the different kinds of documentation. https://diataxis.fr/ is a really solid starting point for anyone aspiring to create better docs.