You've made a wrong assumption. Yours isn't the only forum auto-closing stuff. I'm an expert across a broad range of obscure topics - when I make contributions (several times daily across dozens of platforms) it's frequently on "old" topics that feature highly in google but have no answers/solutions: I provide those, and I take the time and care to go back (often after days/weeks of research) to populate these places with relevant answers.
I've long given up on the "bump a moderator" concept, because it simply doesn't work. It takes AGES, and almost all the time, I end up in an argument with a grumpy/stubborn/unhelpful moderator who refuses to re-open something they think is "stale" for a variety of brain-dead reasons - like "the OP doesn't care anymore" ... so much that I now no longer bother at all with closed posts.
The problem with shooting OTHER PEOPLE in the foot with auto-closing, is that YOU never feel or notice the pain.
What percentage of posts to closed topics are valuable? You don't know, right, because you never did the research?
I notice the extreme conspicuousness of NO EXPLANATION you're giving for the purpose of auto-closing.
WHAT OTHER SOLUTIONS BESIDES AUTO-CLOSING ARE YOU (NOT?) USING ?
IF YOU USED THEM ALL, CAN YOU SAFELY REMOVE AUTO-CLOSING ?
Publicly searchable, google-indexed forums exist for everyone - not just the OP or you. It's an intellectual service which we are kind enough to donate to you.
Stop kicking us in the face.