About a dozen years ago evidence began to appear that patellofemoral taping had no effect on alignment. However, most evidence still supports an analgesic effect. I still use it, because it allows the athlete to get back on their feet & exercising sooner. With the careful use of a slant board & a bungee cord I can usually create a pain free environment. This is important in keeping the linkage system going and maintaining fitness.
It is tempting to place the athlete in a supine or side lying position & try to isolate out those panacea "magic muscles". Keep in mind the injury did not occur in isolation, and every muscle has a 3D function.