While it would indeed seem obvious to do so for all vessels with constriction spots it has not been the practice. All such individual mini procedures for each blockage noted involve some risk of complication such as the vessel rupturing at the spot during the reopening or widening. If that happens the patient may go into Cardiac arrest and not survive. That is bad especially if it happened with a vessel that wasn’t part of the original event. May include legal exposure for suit for taking too much risk for the sake of completeness.