Four matters must be distinguished: sequence (washing members in order), continuity (proceeding without undue interruption), tasmiyah (invoking God’s name), and rubbing (dalak).
The Hanafi analysis does not automatically treat every such feature as part of the very meaning of “wash.” Additional evidence can establish a recommended or Sunnah practice without making it a validity condition. Other schools differ over some details. The legal ranks of obligatory essentials, secondary duties, and Sunnah practices must be kept separate.