I think the Yunnan could host more Airfields. Northeastern India seems like it's vulnerable from the air.
I suspect CCP leaders and military decision makers have concluded one of the following:
1. Very little to no chance of war possibly with quiet Indian verification of this.
2. There is a great or decent chance of war
1. is ideal and means some people can talk all they want about it and make up as much nonsense as they please. Things carry on as they are.
2. means their planning involves almost entirely relying on land forces with a very limited PLAAF support and limited PLAAF capability being offered to this theatre presumably because it is much more important to keep high end assets positioned in the east where the real capability is and is coming from in terms of presenting as a threat to China. This would also mean that the PLA leaders think such a war is winnable with just cyberwarfare + electronic warfare + strategic missiles + artillery^artillery spamming and then land forces. This means sacrificing more lives to preserve equipment and technology for higher end threats. The Indians may want to cooperate with the US in some two front attack so this line of preparation is more sensible than diverting assets west. Plus India is SRBM and MRBM ranged rather than US and US bases in Asia which are either IRBM or ICBM ranged. They luckily don't overlap and so we see this force structure and deployment pattern.
If one goes nuclear, all go nuclear, if one gets pushed to only have nuclear option, that's the end. China is dealing with the absolute devil in disguise with the US. There is no telling how the US will play this struggle out and what level of depravity it will consider and act upon. Chinese unfortunately are often too naive about the world and the always assume the best of the other but get shocked at how depraved they are. They never expected the information warfare to be this intense, or the trade and and economic warfare. Why expect the US to not use every miltiary means? At the moment the US is still unsure about certain victory and is therefore passive in acting but it has never erred when it comes to a lower competitor before. I'm of course referring to the powers that control American policy and not the American people btw. I can imagine China being thoroughly unprepared for this because Chinese leaders can be too naive.