We don't know why Athing pulled out. Perhaps she IS injured. But in most sports, if a top athlete pulled out of a major competition because of injury, they'd be expected to say so, or provide some real explanation.
The other major sport I follow is downhill skiing. It's like most sports - football, basketball, soccer. There is a competition season, and most athletes participate in most of the competitions. (A slalom racer might not do a downhill race and vice versa, but a downhill racer will do ALL the downhill races.) Because of this format, you get to know not only the stars but the next tier of athletes also. I have been a running fan for a couple of decades, but I have a hard time keeping up with who the athletes are. Without Letsrun, it'd be hopeless. They compete infrequently, and when they do complete, it's often hard to watch. In other sports, you might need to get one or two subscriptions to watch ALL the competitions. In running, every time there's a meet, I need to figure out anew how to watch that particular meet, and usually the coverage is poor.
I digress. But basically, our sport is lame. Athing Mu isn't doing anything other athletes in track and field don't do. But it wouldn't fly in other popular sports, and it makes it hard to be a fan.