Since @staff has a lot on their plate and my pet feature request is unlikely to be addressed in the short term, I decided to do it myself:
You can install this userscript for yourself using Tampermonkey. I've tested in in Chrome and Firefox, and I don't think there's any reason in principle it shouldn't work in any browser that supports reasonably modern APIs.
Here's what it does specifically:
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If you've already seen a chost, it'll collapse it in its thread.
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If you've already seen all chosts in a thread and that thread doesn't have any tags, it'll hide the thread entirely.
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It'll always show you the version of a chost you first encountered, even if you navigate away and come back.
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Information about what you've seen is only stored in session storage, which means it'll be reset every time you start close and re-open the page. (If people want longer-term storage, let me know and I can probably make that happen.)
Give it a shot! Let me know what you think!
I believe you can update the same way you installed it the first time. Improvements include:
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It no longer runs on views where it's not useful, including individual post view, draft view, and compose view. This means you won't get weird issues where a post gets hidden even if you're directly linked to it.
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It will now play more nicely with the "show/hide posts" interstitial that Cohost adds for long threads.
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It will no longer bring the "read more" overlay down over the top of tags if it's showing a thread because it has new tags.
Please enjoy!

