1. People can absolutely go out of alignment in the hip joints. But yeah, it's possibly more due to muscle weakness or lack of muscle. An MRI would do a better job of diagnosing that. But you're against that. Over time the condition would come back.
2. 80% of heart attacks are those whose numbers are in "normal range". Your point about number 3 could just as easily be applied to #2 for doctors over diagnosing medications people don't need.
High triglycerides absolutely do not necessarily go hand in hand with high cholesterol. Ask any hyper responder on a keto diet.
Hell, my triglycerides were 115 my last test (high is > 150) and my total cholesterol and LDL were borderline high. LDL is calced anyway so a lower triglyceride number would mean a higher LDL.
3. There's nothing to refute about this. If the OP wants one for peace of mind and has the means to pay for it, more power to him.