1. Not necessarily. Royal Navy's F-35 costs the same as IAFs Rafales. Eurofighter is the most expensive fighter in production. 2. Plethora of examples that suggest otherwise. 3. Can't comment. Information is scarce. 4. Depends on the adversary. 5. Nobody is stopping you from strapping bombs on 5th gen platforms. They'll lose only their stealth properties and retain everything else.