Ary yaar, bhai Modern warfare and technology has changed entire ways of how Wars are conducted, these are not massive armies on horse backs and elephants sending their best fighters for duels, You need to understand when two countries go to war its matter of their survival and existence, and in that case all caps are off and nothing holds any country back, just see what's going on in Ukraine. In case of a full scale War, India will mobilize its full force against the Chinese, you might argue that Pakistan may enter the war but even then, you think that India will let its territory be lost to enemy without threatening the two countries for a nuclear fallout ? Nukes are deterrence and also last resort weapons to scare your enemy in holding on your territory or achieving the war objectives. Put yourself or Pakistan in India's boots and ask, if India Invade Pakistan won't there will be a massive outcry for War ? it will be a do or die situation, so why will it be different for India ? Plus Indians can also halt Chinese advancements using their terrain, Jungles, rivers , mountains , weather and many other factors, and Invading Armies has to go by ration of 3:1, China yes is advancing and so is India. And l haven't even mentioned the foreign help Indians will get from West against China, and Propaganda which you are seeing against Russia today similar to that will be on for Chinese. Seriously try to think Practical, I know you want to see India defeated so do i as a Pakistani, but that does not mean you ignore the ground realities.
I guess our awaam is quite similar in that regard as well, its not just aaloo gosht after all