Close everything older than 2 weeks. If it’s important/relevant, it will crop back up. If it’s not, then it stays unfixed.
This can be really uncomfortable to do. But it’s how I’ve rescued a couple of teams that I’ve led as either an EM or Tech Lead.
Put another way - if everything is important or “must fix”, nothing is.
So to the author: that seemed like a waste of time. I would not have done it because I’m not convinced the outcome would have been meaningfully different from my tactic.