The problem with Priority Pass is poor domestic USA coverage after losing their systemwide relationship with Delta. While it is accepted at many UA and CO clubs I expect this will change after the merger as the combined airline eliminates surplus capacity. This leaves Priority Pass primarily with independent lounges which are variable quality and are often outside security. While this worked well in your instance I think most travellers prefer to clear security before entering a lounge because it's more relaxing to know exactly how long it will take to walk to the departure gate.