I'm not an expert on military strategy, but I have read some military history.
There's clearly cases where high tech wins: a machine gun vs a load of guys with spears, for example. Tanks vs horses.
But when you're at the level of tank vs tank or plane vs plane, one thing that's really important is mass production vs craft production. For warfare, it's better to make something that isn't quite the best, but which can be produced in high volume by not particularly skilled workers, and easy to maintain.
An example of this is the Hawker Hurricane. Everyone thinks the Supermarine Spitfire was the decisive aircraft of the Battle of Britain. It was a great aircraft in the sky. But, the Hurricane was easier to maintain. If the Hurricane took any damage, the ground crew could generally fix it. The Spitfire was more complicated and had to return to the factory. So overall, the Hurricanes outperformed them.
Why do warlords in Africa use AK-47s? Because it's cheap and reliable.
The F-35 is about corruption, jobs and entertainment. Nighttime news doesn't want a boring, practical plane. And the former model interviewing the guy from the arms company or politician will nod along as he explains all the cool stuff it has.