Maybe we shouldn't keep all of our eggs in one basket, India doesn't even have a single engine we can use for our indegnious aircrafts right now, we need a reliable engine which we can scale and serve as the backbone of our jets like the su30mki for our airforce, since no country has mastered VCE yet, it isn't an urgent requirement right now, not to mention with the su57, we would have a range advantage over our enemies either way. Only after we have an engine of our own, should we experiment on next gen engines which may face many hurdles, we should walk before we can run.