Why is Eastern and South Eastern Anatolia and the Black Sea region not touristic?

For vast majority of people, when we think of Türkiye, we think of course of İstanbul and the Mediterranean coast and Cappadocia but cities like Trabzon, Gaziantep, Mardin, Van, Hatay do not get much credit. Why is this? I think it's some of the best parts of Türkiye, where the culture is different from the Western parts. Hatay, Gaziantep and Mardin give off Middle Eastern vibes with their ancient feel and kebabs and Baklava. I think that Many people that like traditional Turkish food do not really know the origin of the cities they come from and believe that they are necessarily from Istanbul. Why do you think this?