Why didn't the Chief Ministers that came from Telangana area work to develop Telangana?

It is true that PV Narasimha Rao, Marri Chenna Reddy (twice), T. Anjiah from Telangana were Chief Ministers of AP. Altogether they were in power for 6-years in four terms. It is also true they haven't made any noticeable development of Telangana. Jalagam Vengal Rao was a settler. He never assimilated himself in Telangana. He is credited with the disservice to Telangana by extending Nagarjun Sagar left canal. Then what about, Rayala Seema? There were stalwarts from Rayala seems that were in power for twenty years. (N. Sanjeeva Reddy-2terms, Damodaram Sanjeeviah, K. Vijaya Bhaskara Reddy-2 terms, CB Naidu-2 terms). Why is Rayalaseema backward? Fact is they slaved for the Coastal Andhra wealth and the privileged few of these wealthy that control the politics of the state. Fazal Ali commission recognized the consequences of mixing a developed area with a backward area and recommended that Telangana be kept as a separate state. If this country's politicians had the wherewithal to listen to the wise men, we wouldn't be in this situation