1. Why not both? We fix hundreds of bug during Major Update and another hundreds between them, with server/client updates every few days.
2. If you think any vehicle miss something it historically had, please submit report with documentation. AFAIK your example with F-104G has been explained already - it's further modification of F-104G we have in game.
3. We have QA department, but due to fact the game is huge (like biggest military game on market now?) sadly it's not possible to avoid bugs.
4. Please submit bug report in technical section, so Technical Moderators can check it.
5. As above.