BF109G What's the point ?

[Yossarian]

So I unlocked the BF109G and I was reading about the aircraft in the hanger section. It tells me the 'G' variant is 46% heavier than the 'E' but can carry much better guns. So when I checked what guns it had by pressing the 'armaments' button I saw it only has the same guns as the 'B'

So what's the point of including a plane that's 46% heavier and then not bothering to give it the guns that made it so much heavier. Or am I missing something ?