I personally don't need bigger injectors, but if you can already control flow with the ECU and an/or FPR, why is it a big deal to allow different injectors? Maybe it's more complicated than the average mechanic understands as Steve hinted to. Would opening up injectors give any car an advantage that couldn't already be achieved with the current rules? Geez, people are talking about RR shocks right now and standalones are legal, injectors are nothing compared to those.

+1 Andy has the right idea on appropriate responses.