The issue with this strategy is that when you have developed an inventory of say 1 million/10 lakh rockets you also have developed the cons of the idea too, that is proper maintenance, storage and sudden explosion prevention.
Solid rocket motors are extremely prone to developing static current which in turn can ignite it easily unless proper mechanism is deployed. It also develops cracks and disjoint parts in the propellant layer which can result in sudden burst explosion when being launched from the launcher itself.
For a guided rocket, you also need to initialise the rocket guidance module before launch with signal via an antenna in the MLS vehicle, or use a satcom which the western rocket do and were jammed/spoofed by denying the sat signal. This is why we use self containing guidance method, no full reliance on sat signal due to dense ew environment. So the guided pinaka also has many electronic module & signal acquiring parts where the shelf life is very poor, even the smallest faulty part means the rocket fail QT before service release.
So what happens to this 10 lakh rocket inventory that you have built up and boast about? you will find 20% 30% even 45% of the total are completely rejected when it comes to use, therefore your money is wasted. This is before any battle inflicted attrition. So you have spent millions of money over the years and are now finding complete scrap heap building & a shortage that you intended to avoid.
That is a test setup, that too for the maiden test. We should be glad its from the MLS, the makeshift one probably was done at ARDE range or Pokhran range possibly. Actual provision we will wait and see, likely 4 per pod. Not too high difference tbh.
My thought on this:
Given the current environment and stakes, within/without the case of 2/3 front war.. India will definitely look to cripple pak army within 3-4 weeks. Max 2 months. To not be bogged down, when China is the bigger threat ( even if no active battle is going on northern border, forces and industry will be kept ready for it).
For that, what we need wouldn't be just inventory of 10 lakh.. but the production capacity in surge. Since, the goal will be quick-shock-destory/cripple the PA's ability to be meaningful threat.. rockets will be prioritised in place of tube artillery, given the lethality and range. Ofcourse, Loitering munitions, SRBMs, Cruise missiles, some naval and air resources will be deployed in tandem too.
Now, I searched and got PIB doc that puts expected capacity of production at 5000/year. That's capacity. In surge time, let's say they can at most 2x/3x it. Since, other demands will need to be met too which shares the production/supply line with Rockets. What's the expected inventory of pinaka today ? 10k-20k? Including the older versions, unguided ones, with newer stock being comparably lower.
How much of that inventory can be dedicated to western border? 3 days, 4dyas, 1-2 week Max if the army uses it selectively and rations it ( their current role) What after that?
That's where I was hinting to.. the production rate. It's so low that even the surge time wouldn't fill the current operational need of IA. 5000/year = 13/day. Even if we take some ideal scenario and 5x production for pinaka without compromise.. it's 65/day.
That is nowhere enough to stockpile enough rockets and replacing expended ones during war. To mitigate it, supply chain needs attention With dedicated person working on widening the pool per system. The "reforms of overall industry" will take time and should run parallel to it.
As for issues/comes you mentioned.. that's an excuse that war won't care for. Same issues can persist for stockpile of 10k or 100k.
Our threat profile have changed. But defense industry isn't keeping up. Limited vendors across the Tier-1,2,3 supply chain for any unavoidable expendables, with limited investment in the scaling of production facilities as needed. Tube Artillery won't give you the asymmetrical domination IA will need to freeze western front quickly. And this is about the products that have been in production for a while with established PSUs responsible.
The sheer numbers required in UAVs is dependent on upcoming drone industry. ( We don't have an industry yet, we have startups and BTPs ). Keeping above things in mind, even the current production rate is pathetic. No need to go back to 2000 to comment on current stockpile.