1950s airframe design with 1970s engine technology. Better make a whole lot of them.
Its so old, its new again!
But really, the hyper-agility thing may have come and gone. The Tejas has advanced (more or less) avionics, a nice radar, look-down-shoot down capability vs cruise missiles and etc., long range missiles (MBDA ASRAAM).
And in theory anyway, if it weren’t for its interminable development time, probably cheap.