What you are doing is misrepresenting reactive countermeasures by China to Indian active moves as active moves by China, and then using that as the basis for asking a loaded question about Chinese strategic intentions.
China isn’t trying to ‘keep the boarder conflict’ going in order to provide a justification to grab land. That’s what India is doing. China is merely reacting to those Indian moves.
As such, it is not keeping the boarder dispute open and active, it is merely resisting Indian attempts at land grabs.
If India would stop trying to change the status quo on the ground, there would be no conflict. The boarder dispute will still remain as neither side wants to give up their claims, but that has been the case for decades. Tension and violence only flares up when the Indians get uppity and wants to try their luck.
If China wanted to take land or change the status quo through force of arms, it merely need to actually do so. India has already given China more than enough excuse to launch a 62 level operation if it wanted to take land by force of arms.
That’s the key difference between the tactical and strategic choices between Delhi and Beijing.
China knows it can settle the boarder dispute to its claim line using military force basically any time it wants. Hence why it doesn’t care to engage in petty salami slicing antics. India OTOH, knows that the only way it can gain any land is through low level salami slicing, where each encroachment is small enough to not warrant a full scale PLA military response, but if allowed to be done over long enough a period of time, will cumulatively add up to a fair amount of territorial gain.
India is constantly trying their luck with little salami slices until the PLA decides enough is enough and makes counter pushes. At which point India squeals like a stabbed pig and tries to draw all the world’s attention to the Chinese reaction as a means to trying to push pressure to force the PLA to stop because it knows full well it doesn’t have the military strength to make the PLA stop themselves.
So, there's nothing here I really disagree with. I just think my first question is being read out of context. I asked in my original post why people thought there was no permanent border solution, and now you've given your answer. I think it's a pretty good one. I do believe the Indians are jockeying for position, but it's possible for both sides to do that. Reactive countermeasures can also include putting on the pressure to achieve some larger goal.