So what is any American player going to do after level 13 or when he lost the Sabre?
Nothing. According to McCloskey no need to get those anyway. Mustang is a joke and Lightning sucks too as it has a very exposed elevator. I'd guess that both planes are not worth their levels at all.
About the guns I just hate that you can crit an enemy with 1 shot from a random cannon but those 50cals don't do shit. I mean, it doesn't matter too much in arcade. People are so stupid there it does not matter too much how well armed your plane is (although cannons favour you a lot even there) But in HB it gets ridicolous.
And when the US airforce used the 50cals succesfully pretty much all war, why is it so bad in WT? So the Kitthawk and similar low tier US planes don't get OP?
They could at least offer a different shell rack for the higher leveled planes or just up the damage in general a bit. Or not making enemy fighters flying tanks. I observe a good bunch of hits that just get deflected from the fuselage, without being registered as hit ingame when I use the 50cal.
For other mgs that is alright and fine as they are usually lower calibre, but with the 50cals being the main weapon for US planes, they could do a bit more than what they do right now. It would certainly make the US tree less fucked up. Besides Corsair C version and the sabre there is not much worthy to go for on the US tree regarding fighters once you have advanced in level.