Of course, if you want a better Slack experience, you can shell out an unknown multiplier of thousands of dollars per month for a paid version (which is never going to happen). The pricing gap for free/paid community Slack is just nuts.
We've been coping by hanging out in private channels. And so the tribal knowledge remains hidden among a small cabal because management doesn't want it discussed. They prefer the illusion that we are...all-knowing or psychic or something.
We ended up finding Discourse, a forum system, and have been using that. Now, slack is more about simulating in person discussion (i.e. we rarely use it), and Discourse is more like emails pre-sorted by category. I have to say, it's working pretty well.
Zulip (https://zulip.org), Dropbox's Slack clone, supports threaded convos out of the box quite nicely.