Likely because they are part of the naval model(s) release, which to my knowledge, is still under development.
I'm guessing here, but likely due largely to TacPac, something only a fraction of the relevant sim population even cares about, or would "demand" as part of the initial release ....

... because they've said the exterior model is finished, an E VC is swappable ... Instead, those of us making clear business case for more models with shared VCs, and staging so that modules like TacPac can be added
incrementally - get pilloried and ridiculed for making so-called "demands". Well, it ain't me "demanding" TacPac, and the attendant nightmare of development that it requires, that's for sure ...
Component-based software development, folks ... win, win - there's no virtue in doing it harder than it needs to be ...
dl