I don't use 'East Turkestan' instead of Xinjiang for a few reasons, though I respect those who decide otherwise. They are as follows:-

a) We're already trying to get the Western public to act on something far away that they don't know about. Sticking to one name helps.

b) Among Uighur in Xinjiang themselves, there's no fixed agreement on what future they want, or on the name. And it's obviously very hard to know under the circumstances of colonialism and oppression.

c) Reaching a Chinese audience - including many people that would be strongly opposed with camps and cultural obliteration *if they were aware of them* - means not hitting buttons that automatically turn them off the issue because of kneejerk 'anti-separatism'

d) Xinjiang is a clear, fixed place, and treated as such in Chinese policymaking and law, which are the tools inflicting great suffering. E.T. is much less defined.