Specifically the one weakness in the current cars from a safety standpoint is that the seating position of the drivers makes them susceptible to back injuries in relatively tame impacts, so the 2018 monocoques are supposed to enforce a safer (presumably more upright) one.
Possibly some of the current/future customer chassis can solve that particular problem as is, either way they would prefer not to have to go through the expense of crash testing and homologation again.
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