Is it strictly mandatory for a Baligh mature person to have performed Hajj in order to financially support all related expenses of another individual who seeks to perform Hajj?
The sponsoring individual is financially and physically capable of performing Hajj. The sponsor’s responsibilities make it unrealistic for them to set aside a full month for pilgrimage?
Performing Hajj is an obligatory worship for every one who is able to. Ignoring or postponing Hajj for unnecessary excuses is a major sin. Muslim who postpones Hajj will die as Nin Muslim according to the Prophetic Hadeeth.
Helping others to perform Hajj is always very good act but it does not excuse postponing Hajj for yourself.
Wassalam.