To add to that, walking has always been an integral part of golf since the inception of the sport. As with most other sports, the fittest, hardest preparing, and most talented competitors are the ones who succeed most often. Golf carts were introduced for a variety of reasons, to include caddy shortages, lazyness, physical inability to walk, poor physical conditioning, enhancing course revenue, speeding up play, etc., none of which were related to actually enhancing the sport. They should not be used to accommodate those who, for one reason or another, cannot compete in the game as it was intended to be played, and thus those who really cannot compete under the same conditions as the other competitors. If one physically abuses his body for years, and thus his ability to compete, through a life-long consumptive lifestyle marked by rampant alcoholism, over-eating, chain cigarette smoking, obesity, and disdain for physical conditioning, which lifestyle eventually wears out his knee, I see no reason to reward him with a totally unearned competitive advantage over those who have not made those poor life choices. Daly has placed himself in the position in which he now finds himself, and it is only fair that he be required to suffer the consequences and not be granted special relief from them.
That said, I always rooted for Big John in tournaments because he in many ways was always an underdog, killed the ball off of the tee, was flamboyant and colorful, was outside the mold of the typical PGA player, and was just plain fun to watch. But he cannot now play the game as it was intended to be played, so he should be done. That other tournaments are willing to admit him out of pity or in order to boost ticket sales or TV viewership does not mean that true golf championships should allow such considerations to dictate the rules of play.
OFC