look bro the rest of the world are standardize jets like F-22, F-35, J-20, JXY and PAK-FA, LFMS to Complement 1st tier air superiority jets (F-22, J-20, PAK-FA) to 2nd tier multi-role jets ( F-35, JXY, LFMS) PAF in that positions to induct 2 different types of 5th gen jets not in the near future or nor in the distant future, it will be burden/liabilities on future PAF, if we need to induct TFX lets forget J-31 and opposite will be same conclusion, how about we put 5th gen Turkish avionics on J-31, just my 2 cent