Like Lemmy or any social media really, you get out what you put in. If you just follow the generic feed without following anyone, yeah it's going to suck.
You can make lists, so one for your friends, one for news, one for a hobby. Or you can filter hash tags to really narrow in on a topic. People also make "starter packs" of who to follow for any topic you can think of.
This format is also unbeatable for breaking events.
Think of it like your house. You can ask people to leave if they say something you find offensive. That is not infringing on their free speech.
If the owner of a shopping mall wants to ban the word banana, they can ask anyone who says it to leave. That is also not infringing on their free speech. That's because shopping malls are not owned and operated by the government.