High tech can easily lead to winning the battle but losing the war. You can have an aircraft that wins every fight that it gets into, but the price of that technological superiority might be that you can't afford to deploy them where they're needed, or can't afford to go to war at all.
The Sri Lankan air force wasn't able to control their airspace in the civil war because their fighters were too fast. I'm sure the F-35's high technology will be well-suited to fighting the Soviet Union. I'm less sure that it will help achieve a successful outcome in the next Iraq, or even the next Vietnam.