About that manpower: how big would the Texas team be, and how big would the HoR team be? I mean, ETS2 has a bigger fan base, but that doesn't have to mean that the ETS2 map team also is bigger than the ATS map team. Besides, it is not efficient to have 100+ people working on Texas or HoR; there is an optimal / maximum amount of people that can work together on one map without affecting efficiency in a negative way.
That brings me to the next question: how many people in total are working on ATS, and how many people in total are working on ETS2?