وعدم تكرار الوظيفة في العمر
The obligatory Hajj is not repeated as a fresh lifetime obligation each year.
A person's ability is relevant to when pilgrimage is binding on that individual. Once its requirements are satisfied and the obligatory pilgrimage has been duly performed, the basic duty is not annually renewed merely by the continuing existence of the House.
Zakat can recur when its legally required financial conditions recur, whereas the obligatory Hajj has a different prescribed frequency. The existence or persistence of a cause does not determine frequency without the governing legal rule.