I am wildly jealous of my cat. He lives a lavish life of playing with his owners, eating and sleeping whenever he pleases, and cuddling with his baby girl who adores the crap outta him.
Being on the sidelines is exactly what I'm talking about when I use the term 'spectator'. It's a common metaphor to describe the stages of parenting. To start, you're in the game, on the field with them. As they go into teenage years, you're the coach - helping them from the sidelines, giving them good techniques, showing them the ropes and giving them a safety net. Once they enter adulthood, you're in the stands, spectating - cheering them on and encouraging them while they play their own game unassisted. Spectating doesn't mean uninvolved - it means you're not making the decisions for them, you're supporting their decisions.