If I may [@Mistiel]. I have a couple of ideas about this particular RP.

I do take issue with the while "juvenile birth defect in the hands" thing that stops people from communicating non-verbally with their hands. It's a bit of a stretch. It just seems too convenient. 

How about instead, people in this world have a severely stunted ability to learn. That almost all these people could only ever know what the progenitors teach them. This, alongside a strict and dogmatic doctrine that deems information from anything but the projectors as unclean, could lead people to having the complete inability to teach others relatively complex logical concepts. 

Also, you could make it that the language spoken is a completely new one that bears no resemblance to the old languages at all. Information on the old languages would be almost completely wiped out. Any information at all could be cleansed by the establishment.

People can still have their own thoughts and feelings, but as most people can attest to, the ability to properly express what is inside ones head isn't a skill everyone has. Nor is it a skill that most people have mastered. Quite the opposite actually.

Perhaps some artistic skills like singing and painting would come naturally but maybe we could make the artists expression of those mediums relatively simple in this world.