Suppose a ritual has a specified number of units. One might identify possible benefits such as discipline, concentration or education. None of those proposed benefits proves that another ritual must have the same number or twice as many units.
Wisdom (ḥikmah) points to a possible purpose of the rule. The operative cause (ʿillah) is the attribute on which legal extension can rest. Qiyas needs a legally established cause, not only a plausible rationale.
When the transferable cause of a specific devotional ruling is unknown, that ruling remains as prescribed and should not be generalized by unsupported analogy.