The only successful Player-Coach that comes to mind was Eric Cantona as player-manager of the France national beach soccer team after leaving Manchester United aged 30.
He won the 2004 Euro Championship, the 2005 FIFA Beach Soccer World Cup along with a number of top 4 places over his 15 years as player and/or coach.
Bill Russell. Won 9 championships as a Boston Celtic under legendary coach Red Auerbach, and alongside Hall of Famers like Bob Cousy. Then became the coach and starting center for 3 more years and won two more championships.
Rinus Michels [1]. There are so many tho.
Kenny Dalglish for Liverpool too, winning the double whilst a player-manager.
The fact that there have been so few of them throughout history of sports shows that this is an exceptional, uncommon situation. A small number of athletes compared to the total. It requires that a single individual possess many qualities at the same time.