The problem with one time pads is that you have to deliver the pad to your recipient first without it being observed in transit. This typically requires cumbersome physical security, and even then you can't be 100% sure.

Transmitting the one time pad over a medium that you can be positively sure nobody has eavesdropped on could make it practical. If someone does eavesdrop on the signal than you ignore that one time pad.

This is the technology that makes one time pads finally practical, at least in some cases.