[_heimdall]

At that point it doesn't matter whether the voting system is centralized or left up to localities. If the election comes down to a few thousand key votes in one or a few localities you are left with a very small number of election systems to keep a close eye on whether that's the central one or a few local ones.

Its also worth noting that just because the central government could run one standardized election process doesn't mean that the election is easier to secure. Ultimately polling places would still be local. Maybe it helps a bit if everyone uses the same system, but that's more about consistency than security.