The max fault level at the end of the cable is largely irrelevant, the Zs/minimum fault level of course is vital to ensure the ocpd operates in time.
If we put a nice long cable run, there is no guarantee that when the user drives a nail between line and cpc they will bother walking that full distance to the far end to do it.
They will probably do it close to the consumer unit, therefore if you do check the adiabatic on the cables, you need to use the fault level from the start of the run, not the far end.
So say I have a Re of 0.08 ohm ( so around 2.7kA on min voltage - 3kA max), we need to make sure the cables survive for 3kA perspective through their ocpd, rather than just the 45A at the end of a long lighting circuit having a 5 ohm Zs, which is within the 6A rcbo/mcb limit.
The standard arrangements assume a maximum let-through of the main fuse limiting the damage, so providing you fit mcbs capable of handling that (usually 6kA), then the standard circuits in the standard, and osg can withstand the let through of these mcbs.
This might not be the case in industrial settings as the fault level may be higher, with substantially bigger fuses, and larger let through of the industrial mcbs.
Hence in these cases you do need to check the adiabatic for seemingly "standard circuits"