One more thing I just noticed: when you long-press the floating action button in the feed, there's a "Dismiss Read" option which seems to remove all read posts from the feed. Although you have to trigger it manually, it might be good enough?
Edit: And I can do you one better, I think: Go to Settings, Account and disable the "Show Read Posts" option. Because as it turns out, this functionality is built into Lemmy.
Interesting, that indeed doesn't seem to exist. Best workaround I can suggest would be to enable gestures and then assign the hide action to one of the gestures.
+1. I've been using Voyager since it was called wefwef. It was the closest thing to Apollo I could find at the time and it has worked great for me for 2 1.5 years now. The team has done a ton of improvements over the last 2 1.5 years as well so it's had great support.
To be fair I haven't looked at any other apps for Lemmy since I stumbled on this one in the early days after the first reddit migration due to the API fiasco, but that's because this one suits me just fine.
For me it was because I loved Boost for Reddit and when spez did that thing back then the dev pivoted his app and it retained all functionality so it was pretty much seamless for me. I bought the app (twice) for the ad-free experience and I launch the rocket (for a small fee) every now and then.