Because Pocket D is not directly accessible via AP or Mercy, while AE is. Many (if not most) people who use AE do so because it's very convenient - asking them to go out of their way will likely be ignored.
As for the OP, think it's a good idea to double up on the Mission Computer functionality. However, I don't see it reducing the Liberty problem, not only for the convenience issue mentioned, but also because not everyone has access to a base, or interest in getting it. Might be better just to drop a trainer in the AE buildings (and a vendor also, if there isn't one already).
I’m fine with any of these solutions - SG Base, Add an entrance to Pocket D in Atlas/Mercy, or just slap a trainer in AE