it's no more a fact of nostalgia... they made their choice when they designed KR, and now they must keep that way because passing to 3d models means rewrite a good part of the client (without counting the drawing of all the models and related textures).
That's right. And that's nothing to say about animations. 3-D clients animations would be created for 30 frames per second. The legacy client runs at a fraction of that speed. So maintaining an art pipeline that supports both 30 frames per second and the frame rate that the classic client runs without creating two completely separate sets of assets, would be really tricky.
-Grimm
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