re: Why do people on this board think they know better than the coaching staff?

The better question might actually be, why do people think Coaches are so smart that they are above reproach? There are only a handful of good ones and many are not really smart enough or qualified to do anything else other than something coaching related.
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Change the next to last word above and include accountant, Medical, Attorney, Engineer, Scientist etc.

Im sure one of us should call Dr. Andrews and give our advice on knee surgeries.

Do u really think u, yourself, can come up with something that the coaches havent already considered?

You should spend your time doing something constructive.
Why not try to invent a new baseball play?