Less riveting error and more extra parts at the end of the job, it seems.
Are the 787 fasteners in question captive screws/fasteners? I've seen Dzuz/Camloc type fasteners in s few applications and the preference seems to be to use captive fasteners.
No 'spare parts' in the pocket and (in most cases) the unlatched fasteners project out from the panel whereas the latched ones pull in flush. This gives a visual check of any left loose.