Frankly ejector seats is not that much of cutting edge tech nor something whose lack of indigenous alternatives , we should be unduly worried about. Alternatives to MB exists in the US & Russia.Argentina was a example . Yeah i agree what you say . But in long term tejas is nt the only fighter jet we ll have to manufacture . One less supply chain issue to worry about in medium term if everything works .
Having said that, good that someone in India decided to crack the code.