I've seen plenty of 'dead' compost piles...that didn't have the right balance of materials, moisture, oxygen, micro and/or macro bugs.Can't be all that delicate....I have no time in maintaining it. Flip over some poop, add some material. That's about it. No additives needed more than that, really...just materials, moisture, turning in the poop, good airflow.
I've also seen piles work wonderfully for years in the right spot with someone who knows what they need and can identify adjustments.
Your coop is on dirt in a mild climate, has been for years and probably teeming with the right organisms, and I'll bet you adjust it without even thinking about it cause it's just natural to you.