Jimmy, I think you are correct that AP was the last design iteration before V-bracing (which IMHO is NOT an improvement) although I'm not sure of the exact timing. There are plenty of folks that believe the Advanced Performance bracing was the pinnacle of Taylor voicing. The single nicest Taylor that I have ever played - out of hundreds played in stores and all the owned examples listed in my signature -- was a 522 twelve-fret with AP bracing at about that time frame.
Put plainly, a 2017 model with AP bracing would be more desirable and worth some premium (at least to me) versus something newer with V-bracing.