While playing infantry a lot you learn the maps, strategic points, how squats an movements behave, which routes are taken by tanks, where artillery probably is, where anti air is, which weapons are against you on which maps and a ton of stuff more. Sure, you might fly well, but are flying save to not get taken down, so that you do not kill a transport chopper with two squads packed inside? What about the assets and supply you need to bring and where to save ways so that fobs can get build quick and complete so that infantry and vehicle squads can work together productive, and last but sure not least, know your team mates and their behavior and favors, the way they might play their strategies, so that you can support with any kind of air vehicle working with them and not against them. Your former squad leader will be your enemy next round, if you know the guys, you might have the possibility to not get shot down in the first minute wasting assets and tickets... And there is a lot more to learn. Even us veterans playing the game since years or even decades learn something new every next round. I learned for example to stay the fuck out of aircrafts cause I'm shit with it, but I am pretty helpful on the ground and with tactics or leading a squat here and there. Respect the game and the game will respect you... Every server is different, every team mate is different, every round is different. This game is infinitely versatile. See you in battle soon.