Besides, Pakistan now has the advantage of first strike, using TNW means handing over that advantage to India on a silver platter.
Not exactly, the idea of the TNW is to essentially lower India's "first strike" threshold and hence the threshold for MAD.
As many dont seem to get, a TNW is not a statement to halt armoured columns flat as much as it is a statement of "I dare you to cross this line"... where the line is not even defined.
The "What if" of a TNW that is likely to be used within the Pakistani border area but on Indian troops leaves it in a quagmire(along with the international community).. if it ignores it then it is inviting many more such strikes and regardless of their less than advertised effectiveness.. the destructive power is still disruptive.
If it does not ignore it and goes all out, what guarantee is there that the Pakistani Strategic forces arent already at that level of preparedness to go all out at a few minutes notice?
And this is not a question of today as many naively assume. TNWs have been in Pakistan's arsenal since the 90s.. what has changed is the delivery mechanism.. previously it would be the Mirage or A-5s delivering th weapon.. now it is on a rapid response system . So where previously there were high chances of perhaps preventing the attack or avoiding it to a large extent.. that has disappeared.
If a TNW does fly, the first guarantee is that the rest of Pakistan's nuclear arsenal is also ready to go within 5 minutes notice.The TNW will get to its target in less than 2 minutes and cause a measured level of devastation and disruption. That effect will be relayed to the Indian leadership.. who then have to decide
1. whether to cut their losses and withdraw.. leaving Pakistan having nuked its own territory but with considerable losses to their own side essentially in vain
2. retaliate with their own TNW.. thereby inviting a tit for tat TNW.. before international pressure and mounting losses without any actual results makes the Indian leadership cave in.
3. Launch a full spectrum strike, hoping that at least some of Pakistan's highly mobile nuclear launch systems are taken out.. whilst concurrently hoping to survive Pakistan's strike which will come with the same swiftness.
In all of this, India is looking to survive and continue.. Pakistan on the other hand may not be looking at that outcome at all.. its "prize" would be not letting India continue or at worst .. letting India continue in a rather miserable state.