Yep! Howard’s source material, the kingdom of Aquilonia covers part of the territory of the fallen empire of Acheron, which corresponds to the Roman Empire in real world. That’s why Aquilonian architecture in Conan Exiles is basically Greco-Roman architecture. The kingdom of Aquilonia itself is more medieval, which is why the Poitainian content in the upcoming DLC has a medieval look – Poitain being one of the provinces of Aquilonia.
No, but maybe we can keep asking? Perhaps – shameless plug – give my suggestion some love? 
Indeed. But all is not lost – Turanian pillars work fairly well in Aquilonian builds:
