Re: You never flew a fighter, did you?
Don't make the mistake to apply what works for IT projects to aereospace projects. Designing a plane is much more difficult than designing a smartphone.
There are the laws of physics to be taken into account, and although electronics is doing a lot to get closer to the physical limits, there's no way to get past them (transparent aluminium and duranium don't exist, nor structural integrity fields, sorry).
Sure, military planners have today a much harder work than just a few years ago. Both manned and unmanned planes have advantages and disadvantages, and it's hard to imagine what will be available in 20-30 years.
But leapfrogging airspace technology is not that easy - it requires huge R&D investment - aerodynamics, materials, structure, actuators, engines, sensors, assembling, and the electronic and software to glue it together. It's not like setting up Facebook or writing Instagram. That's why wannabe countries like Iran use Photoshop to create new fighters, while others like China could be dangerous if they can catch up with the required technology, but even catching up is not easy.
Ships at the bottom of Pearl Harbor are there not because of a leapfrogging Japanese technology - Val and Kate torpedo bombers were not very advanced planes (although they had good torpedoes, and BTW, USA had the first radars instead but weren't able to take advantage of them), nor ships at the bottom of Midway were sunk by advanced planes, nor Dauntless nor Devastator were such (especially the latter - and the "technologically advanced" US torpedoes were a utterly failure - see http://www.public.navy.mil/subfor/underseawarfaremagazine/issues/archives/issue_47/torpedo.html). Both batlles outcomes were due to cunning and bold strategies - not technology. Hiroshima was a huge - and terrible - technology achievement - but how much resources Manhattan Project required? V1s and V2s were another huge technology achievement, but did they changed the war outcome?
Why both Americans and Russian raided Germany technology at the end of WWII? Because in many field it was so advanced it would require a lot of time even for the powerful US to catch up quickly. And for years British plane engines were far more advanced than the US counterparts (think about the Merlin, without which the P-51 would have been a so-so plane, or the early jet engines). It takes a long time to sharpen such skills, and the right background. Germany and England had both the researchers and the engineers to improve technology, but building that background requires years and the right conditions.