That doesn't impact mass fire like you think it does. Due to its titanium build, the M777 sacrifices ruggedness for versatility, unlike other guns. Its advantage is it can actually access certain areas of the battlefield that other guns cannot. Especially behind enemy lines. Being able to bring a weapon to bear at a higher cost is a better option than getting caught in the open without one. LFG is a very low end replacement.
Also:
What if there are sanctions on India? How are you suppose to replace Ge414 powerplant which we are putting in almost all of Indian built aircrafts. The F414 is a 10-year program. If we don't get sanctioned before that, and the program is successfully completed, and the ToT is complete, then it...
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M777 gives us the option of ready replacements from the West, practically free. So we need to create infrastructure to support it in India. In Ukraine, they got the guns as is, and the minute the guns were damaged, which starts happening on the very first day due to CB fire, they got stuck.
Right now, we can only assemble the M777, but we need a production line set up, which BAE is ready to do with a follow-on order of 300 guns. They will manufacture the barrel too. So we will have experienced Indian hands fixing those guns, American and British citizens won't do it for us during a war.
The US operates 1000+ M777s, and some European countries are also bound to buy this gun. Experienced Indian hands, both civilian and military, and quick imports for attrition replacements are necessary in a fight with China.
There's the Excalibur advantage too. Not the capability itself, which is reproducible, but the numbers. After about 6 months or so, we will need 100,000 such shells supplied to us every month during war, affordable only via aid. As our gun inventory falls, we will need to make it up with precision to maintain intensity.