In a situation like that of passion and India, where if one country or the other crosses the other country's ' red line ' it will trigger the nukes and kaput goes everything. What Pakistan needs against an antagonistic India who has openly threatened ' limited strikes ', is to show off something to make the invader think twice before invading. Say three squadrons of SU-35( I know it's never coming but let's assume) equipped with the latest inventory, AESA bvr supported by powerful AWACS would make the Indians not open a limited theatre of war as they know they won't be able to establish air superiority. However if we have those very 35's locked up and hidden, India would strike. If we repel them, they to avoid political humiliation would strike somewhere else and then somewhere else and you have an all out war with a high chances of M.A.D. So by showing off our 'wunderwaffe' we would not only save our selves from losing thousands of troops and potentially millions of civilians, and sending our economy two hundred years back if it survives, we would also be doing the same for our enemy