Important context, original test was created before they were invited to work at Brave and in part because of their creation of the test. And LibreWolf and Mullvad wins the tests, not Brave.

And testing out-of-the-box experience is valid use case as that is what most of the non-tech people you recommend the browser will run.

Also while it's great that Vivaldi has ad and tracker protection added, it's average at best. Installing uBlock Origin with default configuration is better than what Vivaldi offers.