sadly enough he has a point waaaaaay to many people hop in the gunner spot and do that seriously, just dont. unless you have been spotted or are firing your tank is not on radar. if you hop in that top gun your job is shooting infantry and light skinned vehicles. You can always tell a good gunner from a bad one, the good one is constantly spinning around looking for targets. If we get c4'd then the top gunner has failed. The second most annoying thing that he brings up is if the main gunner gets out of the tank to repair he is inviting you to hop into the main seat to drop what ever is shooting at you DO NOT sit there plugging the enemy tank with your machine gun, no matter how long you try you can not hurt it. Now if you are an engineer in the top gun as stated get out, get behind the tank and repair staying with a good tank driver or good top gunner can very easily get you to the top of the boards.
The only point i disagree with that post on thump is that the gunner should be spotting mines. Say you have one of the above mentioned people in your top turret that shoots every thing that leaves you screwed, if you as the driver run either thermal or zoom optics there is no reason you should be running over mines at all. Personally i run thermals and 98% of the time i drive with them on, no matter the light in your face or darkness you will be able to see mines c4 vehicles and people clearer then day.
If you happen to be friends with the person you are with its even better you can customize your loadouts to be the most badass tank you can possible have. the main driver dont really matter on class but to speed repairs engineer is cool top gunner engineer for mid fight repairs but with driver having thermal and what ever secondary wep ( personally i love rolling the hmg mows down people) and auto loader. If you can get a person with proxy scan in the top gun thats an engineer thats an amazing team, I have gone many a level in a tank with a gunner, both of us 0 deaths and a crap ton of points and 9 times out of 10 mvp and mvp2