Indian military industry could not reverse engineer a Su-30 for over 15 years with perfectly good samples in complete form and various levels of tech given by Russia. By the time they could reverse engineer a PL-15E (or components thereof) out of the expended and detonated scraps, China would have already replaced PL-16s, PL-17s and their successors (now tested) from service and may have successor technology to missiles for air to air altogether.