Why is this? Because MS specialists, neurologists and advocacy groups are much more comfortable designing, testing and recommending a drug for MS, rather than encouraging healthy lifestyles and treating venous malformations. You cannot monetize or patent a diet, exercise and angioplasty. It's impossible to have a placebo-controlled clinical trial for lifestyle. But you can develop a drug and make a lot of money selling it to a population with a chronic and degenerative disease.
This is tacet proof that blood flow matters in MS. But you will not hear that from neurologists-yet. They will discuss cerebral blood flow with their patients when they have a prescription they can write.