Now you can buy base in junktown, you can obtain one via abandoned bunker quest, but these bases have no much use since they are very far from northern towns.
Let e remind you that in f1 vault dweller had a chance to help "blades" defeat regulators, so what if we decide in fonline that he did and blades won, and now adytum is unguarded place. (gunrunners still remain guarded of course). Now players would have some use of bases near junktown and abandoned bunker, and maybe additional town in tc would bring more fun :> What do you think?
Furthermore from official sources it is not known if what he did in boneyard, from fallout wikia: "It is not known what is the canon outcome of Vault Dweller's adventures in the Boneyard. The only available piece of information comes from the Vault Dweller's memoirs: I found many enemies, and a few friends, in the Boneyard. I killed when necessary and learned more about the nature of my true foes. It is not known for certain, however, whether he did uncover the assassination of Zimmerman's son by the Regulators and their attempt at putting their blame on the Blades, and whether he freed Adytum from Regulator rule. We don't even know if he killed the deathclaws, so it is entirely possible that Adytum joined the NCR under the control of Regulators, after the Vault Dweller was fooled into killing the Blades. "