After period we don't pray qaza namaz but we keep qaza fast. Why? Explain

After finishing menstrual cycle women don’t offer their lapsed namaz as Qaza but they fast theirs lapsed fasts as Qaza because namaz is the worship which we offer 5 times a day and continue it for whole year but Fasting comes only in the month of Ramzan once a year, therefore Allah doesn’t want His servant’s should have something less in their ebadat specially fasting which can’t be done whole year.