Request REPAIRS please

So the Request Meld function works as follows:
Player 1 has all items on them, gear, materia, and catalyst to meld, but no crafting skill high enough to meld it together.


Player 2 has the craft.

Player 1 selects Player 2 and "requests meld" and voila - can even tip for a thank you service.


WHY DON'T WE HAVE THIS FOR REPAIRS?

Instead of needing materia/catalyst , the person requesting would only need the Grade of Dark Matter....

Nearly everything else is the same, tip and all.


Why ?