That's fair, but I think it loses the distinction between different transliteration strategies. For example, phonetic transliteration preserves far more of the original language than other methods. Transliteration is a necessary component of language: most common languages lack glottal stops and clicks, but it's still important to be able to refer to places that are named with glottal stops and clicks.

In that regard, the TAR has always been referred to as Xizang in Chinese because the TAR covers the Ü-Tsang region. The lands of greater Tibet from the peak of the Tibetan Empire are now parts of Qinghai, Sichuan, Arunachal Pradesh, Sikkim, Kashmir. The unified region of greater Tibet has, in recent history, always been དབུས (Ü) and གཙང་ (Tsang). This is pronounced ue-tsang according to Tibetan Pinyin (phonetic transcription) and Xizang according to transliteration - running through the possibilities, I'm struggling to find an exonym in Mandarin that would be closer in pronunciation.

The traditional name of the region is བོད་ (Bhö). The name Tibet is itself an import from the English. Given the degree of funding the Tibetan government-in-exile receives from the US (an English-speaking country), I'd suggest that the Tibetan government-in-exile has a strong financial incentive for maintaining English...