>>64202408
This is a blurred part of Fallout lore. Unlike the power armor that is now canon as older tech from the war before the nukes, the weaponery may be extracted from BoS research.

And BoS is not the most competent when it comes to research, they are technoskeptic cultists. The real brains are in the different branchs of the Enclave. It's even almost certains that any real evolution will be made by the Enclave in the series.