From the link above, Swarajyamag's article by Mihir:
.. The LCA’s mission computers, electronic warfare systems, man machine interface, flight control systems, composite airframe technology—these have been developed in India and are all flying on multiple IAF aircraft today in the form of upgrades. The MiG-21 Bison, the MiG-27 Upgrade, the Jaguar Darin III—they all source several local subsystems and components developed by Indian entities. The Sukhoi Su-30MKI, which Indian aviation enthusiasts venerate more than any other fighter, owes much of its success to the DRDO-run Project Vetrivale, which was possible only because of the sweat and toil that went into the LCA programme.
To take just one example, some of the technologies developed in the course of the Tejas’ Kaveri engine programme are now used by Bharat Heavy Electricals Limited (BHEL) in the manufacture of gas turbine engines for power generation. If exploited properly, they shall go a long way towards limiting the expenditure of foreign exchange on imported weaponry that generates very little economic benefit. More importantly, they shall empower the nation to take (or threaten) military action while limiting the risks of coercive pressure from hostile countries that might use technology embargoes or the termination of military sales to restrict the supply of critical military equipment.
With a home-grown fighter, the IAF gets a weapon that it can tinker with in unlimited amounts without having to seek approval from vendors guided by their own narrow interests. It gets the freedom to not treat that weapon as a scarce resource that has to be rationed across the breadth of the national border and not worry about treating as a scarce resource. And with the technological know-how as well as an industrial ecosystem largely in place, the development of the next generation of fighter is bound to be a little smoother, a little less uncertain, and constrained by fewer technological hurdles than the LCA was.
Read it all.
Reminds of something similar, from In his last book Dr Kalam writes how challenges triggered innovation
He goes on to narrate that within hours of conducting the hypersonic test, the team had to abandon the plans owing to Germany ratifying the Missile Technology Control Regime (MTCR).
Team started looking for answers within India With the long-term goal of creating human and technology infrastructure within India's boundaries, the team started looking for answers within. "We were confident of our progress so far on Agni. We knew the importance of having a long-range missile for the nation's strategic strength. We also knew India, and India alone, had to find a way out of this situation. Difficulty became a breeding ground for innovation," says the book.
The book also narrates how the data saved from Prithvi trials came handy for Agni as well. "Real flight data from the Prithvi missile proved to be a precious knowledge resource for Agni. We simulated the Prithvi flight path on the computer using the same algorithm, and obtained CFD results for it. We then compared these simulation results against the actual data for Prithvi. To our delight, the results matched-giving us confidence for the Agni CFD results," adds the book.
Such benefits must be kept in mind for indigenous efforts.