Hi,
Pioneer is currently demoing their new Carplay-compatible AppRadio 4 (SPH-DA120 in Europe) with a capacitive 6.2" touchscreen at Paris Motor Show. There IS pinch-to-zoom in Apple Maps, see at 0:40 in this video:
So it's weird that the AVIC-8000NEX, which also has a capacitive screen, does not allow pinch-to-zoom in Apple Maps after the Carplay FW update.