A lot of people complained that the stamina was insane on gunners, and that it basically broke the game. As far as making the gunner usable on all corners, I do not see a reason to. Any class based game you play, medic is gonna be the most important class. You always need a medic/cleric. Sure, shooting needs to be done, but there is no reason to change it so that everyone wants two gunners instead of two engies. The "balance" that most people are looking for is one that allows for one pilot, one engie, one gunner, and the last can be either engie or gunner. Stamina made it too much gunner, and most a lot of people think right now has too much engie. The balance is the problem, and the only solution is to try multiple different ways, test them repeatedly, changing them a little at a time, until everyone is happy. The only issue is that everyone will never be happy. All muse can do is make the most people possible happy.