Now that we have new ships on a regular basis, we will at some point run short of the Prismatics we have in store, and to get new ones we will basically have to register either with Aisling or the very least another Imperial. Ok, that has always been the case, but it used to be easy and of no consequences, alas now it is, as PP got more important as a gamplay and climbing ranks is now much longer. Other modules, it's ok, they're nice to have, if you don't have them it won't put you at a disadvantage, but Prismatics are different, they became an absolute necessity for anyone involved in combat, so they should not be a rank module anymore, as they create a clear imbalance in PP and for those not aligned with Imperials.
edit: I realize I wasn't precise enough, my apologies: I'm talking PVP here, if you don't care about that and don't care about Prismatics, then yes, this post might not seem relevant. However, Aisling has always been by far the most sought after affiliation, that should tell you something about the importance of Prismatics as not everybody indulges in PVP (I know, now it is Edmond, but because he is the fastest way to get the Concord Cannon, only module veterans didn't have. That won't last.).