Stealth has real benefits. Portable radars can only be so big.
There are reasons the F-35 is being bought around the world. You should also look at how the F-22 and F-35 have done at Red Flag type events, which are as close as possible to real combat.
FLIR/IRST also have a place, but have their own limitations.
I consider it to be the 21st century equivalent of the Brewster Buffalo. It will probably end up killing as many of our pilots as the Buffalo did in the 1940s.
There are reasons the F-35 is being bought around the world. You should also look at how the F-22 and F-35 have done at Red Flag type events, which are as close as possible to real combat.
FLIR/IRST also have a place, but have their own limitations.