Sounds like a trick question designed to flush out the smarta**es.
So, here goes :
This cable does provides cross-platform support, in case of a collision. It is asymmetrical because it is only intended to aid in collisions while on port tack, which since they will be your fault, will entail larger $$ outlay. For collisions while on starboard tack, damage will usually be responsibility of other party, so there is no need to carry the extra weight of this kind of cable.