All lines from a DP also need to go to the same cabinet.
Not
entirely true, I know of streets where there are two DP blocks on the JUP's, one will be (for example) DP103 and the other DP 103A, they feed to different cabs...... this is rare, but not unknown.
So you can shift the line on to a shorter D side in response to a fault or some such, BUT if there's FTTC involved the powers that be cannot just make a port live at the new cab just like that .........
Back in the day redundancy was built into the network, there was often options .... Not so in these bean counter driven days.