Or This may also be done to keep Pakistanis capable to counter India since China didn't do enough in this area.
What will F-16 do?
Per capita (PPP) income of Pakistan = 4749
Per capita (PPP) of India = 5808
If bombing with conventional weapons, how much entire air force of Pakistan be able to bomb, before it falls to pieces.
It is a foolish assumption that India wants to invade Pakistan. India has not built the capability to invade. India has only built the capability to punish any ill-thought invasion by Pakistan.
India is not interested in land occupied by Pakistan.
However I can tell you reliably that majority of Pakistan will join India if given a free choice.