> I could put zero effort into writing a quick post on some piece of programming knowledge

For starters, if you're writing something yourself, it's not "zero-effort". It might be low-effort, but you still put some effort into it. And low-effort doesn't mean worthless, as you illustrate ("but if someone needed that information...").

Consider that the refrain seems to be: "I won't put more energy reading something than you put into writing it". A "quick" post takes little energy to write, and little energy to read. That's fine!