The headline may be deceiving itself... "the Red Sox stars" - as in plural?
Atlanta's entire infield is comprised of All-Stars, and they have an MVP rightfielder and a DH who's slugged 77 homers the past two years. A core like that should play as much as possible if you want to win.
In contrast, Boston has one rampaging star outfielder, and some others who are pretty good at basically one thing: corner infielders who can go deep when their bodies let them, a decent shortstop glove that's rarely healthy, several all-or-nothing power hitters, a contact bat with little power, a catcher who can hit better than he catches, and some utility men who rake lefties.
If the next Sox' core reaches true stardom, please surround them with able bench pieces to give them an occasional rest -- like Cora had in '18, and Francona had in the '00s, and Zimmer didn't (or refused to use) in the '70s.