Well good for you cause the Tibetan Government in Exile and the Dalai Lama do not want independence.
https://tibet.net/important-issues/the-middle-way-policy/
So, they are asking for the next best option as a compromise - even the proposal is called middle-way for it is a compromise.
There are some Tibetans that don't think true autonomy is possible with the CCP and thus still want independence though.