I was in a hurry before and didn't finish my question.
fundamental Chinese identity might be something as simple as: we are oriented on *this* group and we sacrifice for it, and we are related to our families and our family's family by duties of obedience, and we, as a people, are old.
From what I am inferring from your post culture then is a choice. We choose to ally ourselves with a particular form of culture. An example could be a mate of mine, born, educated, grew up in the UK, but he quite clearly states that he is Indian - because his parents are. However, he speaks very little Indian (Hindi or any other form), has visited perhaps half-a-dozen times - for me he is choosing a culture.
The options you offered for the Chinese are similar to all cultures aren't they? I'm Australian because I was born there, so am oriented to that group, I sacrifice as much for Australia as I see most Chinese sacrificing for their country (I probably sacrifice more, by paying taxes!!).
I am related to my family and family's family by duties of obedience (well, only when my Mum was alive - but check out the little emperors and the '80/90s generation in China - not too much obedience happening there!). I would say that I am related by the bonds of caring and love, rather than a Confucian concept of duty that is rapidly dying out.
And we, as a people are 'old'. For that one I figure we all came down from the trees at the same time, and the splits and re-alignments of China (Warring States, break aways etc) are no different to those in Europe.
How much of 'high-context' do you see in the culture? In language and guanxi customs, I would see a reasonable amount, but where else do you see it? I would also see that these are changing in practice.
Where things remain unchanged it is because technology remains unchanged. Therefore in essence, whilever there is a basic agrarian system in place, then the rapid changes of officials, court intrigues etc make little difference, unless the rulers (Kings or Emperors) try to extort too much. The majority of dynasties did not last for very long, so China has been in a state of change, in official terms, pretty frequently since the Qin Dynasty in 221BC. The Mao Dynasty has perhaps lasted a little longer than some already (Shun, Sui etc), complete with the court intrigues and attempted overthrows etc.
With the advent of greater technology, the reliance on an agricultural/artisan base decreases, and change becomes more pronounced further down the ladder if you like.
Where you have the rapid change in technology you don't have the time for the depth of relationships to develop to maintain a high context culture. High context is based on shared understanding of the fundamental things, and with a complete change in lifestyle (peasant to IT specialist or factory worker eg) and change in location (Inner Mongolian village to Shenzhen) then you lose the high context background and need to relate more overtly. Each move for an individual decreases the high context process in total for a society.