My grandfather played his first few holes of golf since receiving a heart transplant, multiple back surgeries, a knee replacement, and a titanium humerus last year. He only played 4 or 5 holes in a cart on an executive course, and didn't always hole out. Still, you could tell how much it meant to just be back out there again.
I like this idea that the spirit of the game might be rooted in the experience of the individual, and that it's about finding something that brings you happiness, satisfaction, relaxation, or peace.
Maybe it's the very act of worrying about things like anchored putters that is against the spirit of the game.