I don't get that either. The "All" feed ist just a random pile of uninteresting stuff (to me). Lots of news of the day, memes that aren't even funny... I think I would have left Lemmy a long time ago if that had been my experience. I subscribe to the things I want to read. But I took from a few conversations that some people like to browse the "All" feed. I still don't get it.
I kinda lost hope that Lemmy will provide us with a new and different approach to this. The developers are kind of doing their thing. There have been suggestions and new ideas. But usually they don't get implemented. Maybe they're just not that progressive. And a few attempt I read about were really radical in re-defining social media. And people also don't seem to like anarchy and freedom of speech over everything else because that just ends up being a place for trolls. I'd like to have something in the middle. And I think we've already learned a few things in the time Lemmy has been around.