Because, the more advanced planes are faster, and when you increase the speed of a plane (any plane) it loses the advantage of turning and rolling. If you were to take on a I-16 Rata or I-153 Chaika in combat, they would out roll and maneuver you because (not theory since it's been tested and proven) they would be able to roll and turn into a dive quicker. Why? Simple, their not as fast as the later planes, and when you increase speed, you have to go into a more broad turn or dive because you'll either stall or tear your wings off. Sometimes even black out? Speed isn't everything, especially in maneuverability where the slower you are, the quicker you can turn etc.
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