What is the rush to tally the ballots? Do we need an _instant_ count? Isn't that actually a negative attribute as far as security is concerned?

The distance between the election and the taking of the office is often months. I just don't understand why electronics need to be involved at all in this system.

FWIW Swiss elections are counted in at most 6 hours, usually quicker except for big cities. If your system takes longer than that, it's a bad system.

Also it's not just elections to offices, but also votes on yes/no propositions, which can take effect more or less immediately.