The problem with high blood pressure is arterial damage. So it doesn't matter if it's from a "great heart" or if it's from some other pathology. High blood pressure, no matter what the cause, damages your arteries, kidneys, etc. It must be controlled to help prevent long-term complications.
The main issue with bodybuilders having high blood pressure is that a proper sized cuff must be used. Somebody with huge arms would actually need their blood pressure taken with a thigh cuff, not just a large adult brachial cuff.