The crux of the issue is not the computers that tally the vote count, but the vulnerability of our critical infrastructure, like the electrical grid, which if it goes down, would impact everything. It is pretty hard to enable voting and tally the votes if you don't have power.
Everything I know about our infrastructures is that they are vulnerable to attacks. Nation states have been probing them for years and could have malicious code already inserted in them, waiting to be activated. I'm also guessing that many of our government institutions that are responsible for managing the vote don't have backup generators that provide emergency power. Unless of course they are co-located with some other essential service.
The actual hacking of the electoral system would be hard to do, mainly because of the decentralized nature of our voting processes. We have thousands and thousands of precincts and counties managing that voting system. In this case it is not a monolith system, with a Heinz 57 variety of systems from manual to some being completely automated.
The sad story is that this cyber vulnerability is going to be with us for a long time to come. At this point, I don't see any end in sight. Cyberattacks will be a technological hazard that will be with us on into the future--forever.
