Why is the Open Factory project only offered for the Mountech factory in Ho Chi Minh City?

After Hanoi, Ho Chi Minh City is considered as the arrival and departure airport for international tourists. The second Tatonka factory is located in the Binh Dinh Province, which is far from the tourist centres and very difficult to visit. Furthermore, the tours of the Open Factory are given in English. Many of the staff in Ho Chi Minh City speak good, clear English.