I think unlike with Reddit, what you see if what you subscribe to.

This was also the case with Reddit, unless you intentionally went to /r/all? Or am I misunderstanding you? To clarify I always used RIF or went to old.reddit and was never force-fed any content from outside my subscriptions, when I stuck to the home-page.

If you don’t like what you’re seeing, change your subscriptions. Not having Reddit force stuff into the feed is nice but it also means everyone is fully responsible for what they’re seeing.

You make a good point, but I think here's where the current downside of Lemmy comes in, discoverability between instances are pretty bothersome and not easily handled unless you again, go to your instance /all and check what other communities other people on the instance are subscribed to.