Yeah, that much is true. I get antsy watching my teammates from the sidelines in boccia because I want the best for them, not just because they're on my team, but because I want them to do their best. It's hard for me to not shout encouragement, to wait until the game is over. And I have a hard time watching the opponent do their throws.
I can see why Magic, Bird, Jordan, the Pistons, guys like that had such an issue being taken out of games and watching from the sidelines because I've felt that in my own sport.
At the same time, it is true that they needed to be rested for their own good, that Magic and Bird might've had longer careers if they were rested.