I've always browned meat balls.
Then I remembered the jail cell scene from the movie 'Good Fellows'. The mobsters were living the life of luxury. One scene showed one of the Mafia boss's 'soldiers' making meat balls in tomato sauce. In went the ingredients for the tomato sauce in a big pot.....no debate about that. Then he carefully added meat balls the size of golf balls. The meat balls had only been hand formed and were raw.....not browned. IYO is this actually the 'authentic' Italian method for meat balls in tomato sauce. The sauce was on a 'low and slow' simmer BTW.