Ok with this idea at the condition it's an option that I won't use

I am the one who craft, so I'll have to take the mats from the retainer, hand to hand, that's what is happening now.

How do you explain you'll craft something in "Podunk" (in the middle of nowhere), using retainer's mats when that retainer is located in one of the main town? Mats are not sentient to use any kind of ether teleportation flow ..

Anyway, that will never be implemented, just because it's not worthy for SE to put some devs on this.