You wont be able to do offensive missions without tanks, and to win a war at some point or achieving stalemate you cant be just on defensive. And you cant see Air-Land battle from a single prism, you need all things in a joint soup.
Furthur, you cant be like just invest in SPH, and voila all problems going to be solved, just check the terrein we are in
You wont be able to deploy SPH in such terrein (might be possible after Sela tunnel), you going to need lightweight towed guns like Bharat Forge's ULH-Titanium or MArG-T, that cleared for being carried by Mi-17/Chinook and in future with IMRH.
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Furthur, the decision of buying Light tank of 25 ton was quite bad one, what they needed was NAMICA carrying IR NAG with Tandem warhead for tanks and Laser guided HE missile for destroying bunkers.
For Pakistan, you going to need tanks and attack helicopters in large numbers for launching offensive missions especially for capturing Mangla Dam, and with greater 360 degree situational awareness (which is already developed by Tonbo) and implementation of BMS with IFF. But as we know Indian army is the slowest one in adopting new technologies, it took them 14 years after IACCS to adopt Akash-Teer network.