5th generation fighters are thoroughly overrated and overpriced. The stealth factor will evaporate in a decade or so due to rapid advancements in ground radar tech.
Watch the Vox documentary on F-35s.
BAF would be left with unnecessarily complicated fighters with a number of compromises to accommodate so-called "stealth".
BAF will be much better off investing heavily in 4++ gen fighters and then jumping straight onto supersonic UCAVs which will be a reality by 2050.
Two things:
1. Fighter and AEW radars are more important when detecting other aircraft. Even in a decade they will not be able to detect stealth aircraft at anywhere near the range of other aircraft.
2. EW systems on aircraft can trick ground radars to not see them that easily and 5th gen fighters have the most advanced systems naturally.
There is a reason why USA(two planes and 6th gen now in development), China(one plane, one project and a 6th gen already in development) and Europe(two projects of 5/6 gen in development) are investing so much in this area. I think they know a bit more than some documentary maker.