It isn't a matter of stops. It is a matter of local contrast. Local contrast = detail. A blown highlight means there is no detail in the negative, meaning there is no contrast in the highlight. This can be an issue with severe contractions or compensating procedures. It may seem counterintuitive at first, but excessive contrast reduction can result in more blown/blocked highlights than when developing to normal contrast.
Originally Posted by baachitraka
A dense highlight may not print straight, but there might still be good local contrast (detail) in the negative. So you use printing controls to bring those dense highlights onto the paper.