it's unaffordable for one country....europe tried a joint team to keep up and showed they couldn't organise a nookie in a brothel. The plan to 'vastly' improve on the f-15,16,18 failed, coming up with the typhoon which I thought would be the best of the 3 ...only to be let down by poor development funding like the rafale has.
it's even the same story with choppers.