Nope - you can personally go and check how votes are counted, verify the final tallies yourself etc. All parties that participated in the vote send one or a few

Nope - you can personally go and check how votes are counted, verify the final tallies yourself etc. All parties that participated in the vote send one or a few people to all voting precincts, and each of them can carry on parallel votes, make sure votes and tallies are safe on the way to bigger centers etc. Of course, it's not possible for literally every citizen to this themselves, but since citizens already have to trust the party they are voting for to some extent (otherwise, why care about the election?), this works out very well in practice, especially if you add a few citizens organizations and international organizations in the mix monitoring as well. Electronic voting is orders of magnitude more complex, even in simple centralized schemes. In more decentralized schemes, it becomes completely, hopelessly intractable to ensure validity unless you chose to blindly trust hardware and base software (microcode, BIOS, disk firmware etc.). And the same argument about trust above doesn't apply here, as it's not your preferred party's representatives that have created the hardware etc. This is why electronic voting is unconstitutional in some jurisdictions - Germany, at least.