At the tippy top of any profession, people are not fungible and they’re also few in numbers. If you’ve got millions riding on your injury healing optimally (or, really, if your team does), then you might be looking at fewer specialists to do the job than you can count on one hand, especially for very specific stuff.
Think of it this way, the athletes themselves could study specialists to learn the best techniques for their sports, but that doesn’t mean that every athlete can perform those techniques at the same level.
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