Still to be explored, the connection to Jews and customs. One sect has been (Padamsalis/Telugu Devanga) found to contain the traces of Jews relocated to South India while the North Indian settlers have been identified. This is 900 years history!
Rich folks do not help poor (I know even the gold medal to honour 12th Std prize winners were taken back in 1986 at Tirupur), Willful neglect of Vegetarianism, mingling with the Dravidian community for marraige, even though claiming to be close knit (I am not against it at all!) etc.. are the current issues.