When I say “feed”, I mean the general homepage I see when I log into my account, rather than my Subscribed, Following, etc. views. I understand your concern, but if other related communities don’t suit you, then you’re free to block them as they come up. I think a ratio of 4 “in-bubble” to 1 “related” post would be fair. Maybe there could even be a slider somewhere depending on your software.
One of the few reasons I’ve never minded that part of the presentation on larger social media sites is that they operate on an opt-out model compared to the fediverse’s (current) opt-in model. But I think there’s enough transparency in “you like memes@fedia.io, here’s content from other groups we know with names containing ‘memes’”.
I may have to try out Quiblr, but I strongly prefer kbin/mbin to Lemmy, because I enjoy interacting with both the microblog side and the thread side of the fediverse on a single account. If mbin ever gets a video tab (for Loops & PeerTube), I’m going to jump for joy.
If it doesn’t have a VGA port, I don’t use it.