There's only one reason to have a home receiver, but it's a biggie

Upgrading your TV audio can come in many different forms. For a lot of people, it's plugging in a soundbar, and I can't even lie, that's a massive difference from your TV speakers. It's easy to just stop there if you're looking to keep your piggy bank intact. I used to think that way, but I eventually decided I wanted surround sound, and the rest was history.

Source : https://www.pocket-lint.com/home-theater-receiver-needed-audio/