How is this making the game harder for new players?....
Who has perks to burn? It's not new players. The players doing BnZ don't need to use a perk plane but they can. If they could only get away in perk planes they'd likely use perks instead of changing their game play.
I'm just pointing out how the unintended consequences consistently favor the experienced players. The argument is always that the new players will benefit in the long run, if they stick around long enough, but the immediate consequence is more difficulty for new players.
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...I believe the high top end speeds of the later war planes makes the practice more widespread.
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It's not the speed of the late war aircraft so much as the differences in speed in the plane set and the fact that slower planes generally turn better. Few people want to stall fight a Ki-84 in a P-51.