How could be the FW-190 series (not counting Doras and TA-152s) high altitude fighters? Germany keep the Bf-109 on production because the performance of the 190 decreased at high altitudes very badly.
Not every plane performs like it's real counterpart. For example, the fake P-51Bs (if they are performing like As) aren't very great even at low altitudes, and if they are supposed to perform like Bs it's even worse.
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