Because of half gen gap. Tejas is 4+ gen fighter with recent upgrades, Rafale is 4.5 Gen fighter. While we can't ignore tejas with 8 hard points, and powerful U.S.A engine , mix of Israel , French and india technology. It is potent fighter in light class league. It provides good punch and best figher in light class league with such mix of best technologies in single fighter. As it is home made fighter India can play with weapons, swipe & swipe when need arise. Production rate will increase after recent prototype passed all tests & after changes in Frame . It took time but it appeared as very potent fighter, I will not hesitate to say Best figher in light class category.