When bleeding stops before the ten-day maximum, Hanafi reasoning gives special weight to completion of purification through ghusl. The reading that speaks of purifying oneself becomes legally relevant; cessation alone is not assumed to settle every consequence.
For example, bleeding stopping on the seventh or eighth day is not treated in all respects like stopping at the ten-day limit. The difference affects the rules of marital relations, prayer, and purification.
The general interpretive point is that two established readings may apply to distinct legally relevant circumstances.