Well the wording could have been better :PI don't think you understood what I said. I didn't say it was the reason it wasn't put in base game, I'm saying it was a possible extra reason it wasn't added back into the base game areas post-DLC.
If what you meant is "they didn't try to put it back in the base game after DLC launched because it would have been either impossible or a unreasonable development cost", that'd be something I can agree with.