I already responded why those creations wouldn't make it to the Bureau, and Emet needed a guide through Elpis and didn't know the researchers personally nor their work. "The greatest sorcerer to living" didn't even know the person he was gonna try to convince to take a seat next to him in the Convocation.
Like I said, they were ENCOURAGED to submit their creations and I don't recall them having an OBLIGATION to do so. And in the case of the children toys you mention they would benefit kids in their society, meanwhile we stablished the entelechies would have no practical applications so they would be more personal projects, without a need of being shared with society at large.
What I mean is that when she talks of the people, ourselves included, she doesn't see us as the ancients we all were once, not even us who once held a seat in the convocation, and the same one she once held. She speaks to us from a perspective of being our "creator". Venat didn't create the ancient humanity, she was just another person who once walked among the rest, so everybody else were her equals. But now she no longer refers to anyone in that way. Rather, she now refers to everybody as her creations despite us supposedly being the same humanity. Why would that be if this was "the same humanity" she didn't create? If humanity was merely transformed and not created by her why would she be the mother?
Like I also said earlier, she changes her tune about referring to us and to "humanity" depending on whatever narrative they were going for in the particular scene. Acknowledge she's inconsistent, she'll talk about mankind and "our journey" when that sounds like a prettier, more poetic narrative for defeating the ultimate baddie with all the power and memories and love and friendship and sacrifice from all the entities who live and once lived upon the star and at other times she'll make the distinction between us to justify her sundering.
First of all you quoted the part that I scratched. Second, yes the act she was """forced""" to make could also fit a 2nd purpose but don't claim that 2nd purpose is WHY you did it when you were really forced by the first.
Because until the very end they weren't aware that there was a conscious entity causing the Final Days, and an entity that one of their own created, as oppossed to let's say a natural anomaly completely unkown to them. And since they had something super important to take care of, namely a phenomena that could erradicate them, I can see researchers abandoning their hobby projects about an impractical energy source and putting all their efforts into finding a solution. But do you honestly believe if they had known that dynamis was at the core of the problem and that one of their own creations was responsible they wouldn't have put all those efforts into its research?