I've read papers that consider the problem of sharing entanglement between A and C with an intermediate B. A and B share an entangled state and so do B and C. Then, entanglement swapping is used to create entanglement between A and C.
Now, in the optical fiber case, if A generates a Bell state and sends one half to B, B could simply transmit the received photon to C. This would create the required entanglement between A and C.
I understand that the motivation is that transmission may be lossy and hence one has to consider alternate techniques. But in principle, if the channel was perfect, is there any problem in doing what I suggested?