not every country can maintain a huge number of heavy twin engine aircrafts, thats where single engine light fighters come into play, since we have a huge airspace, we need more fighters to do sorties every hour of the day, since at the moment, we lack good single engine and dependable fighter, we have to work with heavy twin engine fighters, which actually increases the cost of flying per hour or the cost to keep the country safe....
Thus in my opinion, single engine fighters like gripen, tejas and F16's do justice to the budget and also relieve pressure of the heavy twin engine fighters.....also maximizes the life of a heavy bird, maybe we can keep them ready for war....