Exactly because the involvement of Lockheed Martin, Korean can access much better American technologies comparing to India. When Korean pulled out this design, they already have plenty of mature US/west technologies available to them. This minimize their technical risk.
On the other hand, there is a lot uncertainties regarding AMCA. Its outfit has kept changing. That make people wonder if Indian scientists have finally settle down their work with Indian industries. Meanwhile, the capability of India's domestic industries to supply the required sub-systems in time is another question. Even if India decides to rely on foreign technologies, the level of technologies won't match those provided to Koreans.
Most importantly, we haven seen the Korean jet on the assembly line while AMCA is still on the paper so far.
And more importantly , I would like to ask how many countries have f 22 design (except china ) , nobody. That's their classified project , at most they will be allowed similar airframe but placement of avionics , layout , tech and all won't be allowed .
Usa already denied Koreans radar and some important avionics , are you talking of this type of access to western tech .
Korean jet on assembly is a 4.5 gen jet , amca design has been inconsistent due to change in configuration , dsi added recently , tailplanes changed , nose cone is changed a bit .
They have to develop a aesa , we already have one under testing , which outperforms elta 2052 on various parameters ,