Sure. But there's ambiguity in this. Tanks are excellent for mobile defence. Chawinda?
It may sound attractive at tactical level but not at operational. For example if a holding corps commander employes his armour for counter attack or even a spoiling attack, it would be be counted as an attack only at tactical level, because the operational objective is still defence. What do you think is the purpose of armd bdes with Inf div?
Also, I don't support ad-hocism etc and I'm speaking only as someone sitting in GHQ would feel during war time. Imagine yourself as a CC 31 Corps, defending for example Bahawalpur. Now if GHQ gives you newly raised reservist inf and tank regts, you and your GOC can start taking some risks, perhaps throw another bde to the frontline or even counter attack because you have your main objective is somewhat secure.
It would be interesting. Nice thing that army is preparing for the worst. But I believe a good GOC will always make his formation available after handing captured territory to inf.
I think you and I are not on the same page maybe or I didnt get you.
CO 25 Cav was attacking in Chawinda scenario, he wasn't defensive. If you are thinking of pitting Pattons against T-72 or T-90, it's not a good idea. It's better to hand them over to FC based on examples of Turkish usage of M-60 Pattons in their war against insurgents, but eventually Turks had to bring in Leo2A4s too.
Secondly, in 1965, India also didnt have a MBT to maneuver freely in the desert for long distance engagements and the infrastructure to support it though Centurion would have fared well with an excellent logistics support and a spirited commander like Rommel to threaten Sindh cut off from Punjab. This hold true today with T-90.
Thirdly, India hadnt exercised war games of Division and Corps level in desert to throw Centurions in the desert under its armored divisions. Today, its different, India can pitch a Corps level armored offensive in the desert region from Badin to south of Okara (Bahawalnagar) , and protection of that corridor by T-59s and M-48s even as reserve is impossible. You need highly mobile forces (MBTs with big engines/filters/logistics as well as Gunships and UCAVs which can cover distance with in minutes, not hours ).
Fourthly, even if you put defensive lines of M48s and T-59s, Indian armored forces will be more mobile than them and just like 1971, they will by-pass strong points and attack from rear or flanks to decimate these forces.
Fifth, intel wasnt strong in 1965. India didnt know that only a lone regiment divided in 3 x squadrons is blocking an entire division. That fog of war is not there anymore. India has very good satellite, intel and recon capabilities today.
Sixth, M-48s used to bog down and so do T-59s in different terrain, even in Northern Punjab. So if you think they will make a difference in the desert, its difficult to ascertain. PA will start with a force of 100 MBTs of each type and in the end 75 or 80 will be deployed due to bogging and breakdowns. This is not expected from modern MBTs.
Tanks can be very useful in defensive warfare, just a matter of employment.
If they are AKs and VT-4 yes, but not M48s and T-59s.