Are you comparing the experience of L&T in submarjneBy that logic no new company would ever rise in a new sector.
Expertise comes with skilled experience people and with partnership with established players.
How did l&t got expertise? It started somewhere!
You don't equate offsets to designing a complete system. Anyways your argument holds no good when capable private companies with decades of working in this field exist. First let these companies work with DRDO and then it shall get it into such contracts . The amount of advancement l&t has made in submarine construction in huge. So it deserves better than adani.You do realise offsets are involved in the deal and reliance is building parts for falcon jets by learning from dassault!
You will hand over project to adani over l&t only if your bribed .I do not even see any other possibility.