They’re all very relevant, but I try not to expect the same from OSS projects as from a VC pitch deck. After all this is work given freely.

A more charitable way I prefer to phrase it: ostensibly you invested time and effort and then shared it with the goal of other people using it, so investing further efforts into the readme helps you achieve this goal even though it might not be as fun as writing code.

It's like when someone shares their hobby programming language after investing 100s of hours of work yet didn't even invest 10 minutes writing a "quick start" heading of their readme. I would like to gently encourage them to reach for that low-hanging fruit that's so easy to overlook yet directly serves their goals.