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In the Russian tradition, technique is never practiced in isolation from musicality. The primary goal is to achieve a (singing) quality, treating the piano as a vocal instrument.
If you want, I can:
Look at videos of Horowitz or Kissin. Their wrists are never locked. The wrist acts as a suspension system. For every finger stroke, the wrist oscillates slightly in the opposite direction. The PDF diagrams this as a series of waves. A rigid wrist stops sound; a flexible wrist releases it. Fundamentals Of Piano Technique - The Russian Method Pdf
Focused on finger independence and strength. In the Russian tradition, technique is never practiced