The experts know less than they care to admit.
I know one thing - I would never let anyone roto-rooter my blood vessels. Angioplasty and bypass surgery are no more effective in the long term (5 years +) than drug therapy. The risks are real; the benefits highly questionable.
Don’t expect a cardiologist to agree. Their knee-jerk resonse is to fiddle with your arteries and heart, in spite of the evidence showing it is not the safest or best treatment option.