Well technologically they are, but they are also far ahead of China too. China was able to come up with the biggest 5th gen fighter ever. It is technologically possible for India to build a 5th gen plane. I dont see a reason why not?? But we lack govt support and biggest of all we lack BALLSSSSS..
GOI is scared to invest billions in an all Indian program, instead they chose to suck Russian Dick.
Two countriesvyou mentioned earler was developed nations.China is a 9.5trillion $ economy even if they are developing nation and can fund any luxurious program without any public consent.
All these cant happen in India. a 2.3trillion $ economy with 125crore people.
Fifth generation program is a luxurious R&D effect.
It will take time.