It is theoretically possible to devise a mathematically secure electronic voting system using cryptography, but only if everyone can follow instructions perfectly and people can understand how it works and why their vote is secure. In other words, not in any way that would work in real life.

The principal benefit of pen-and-paper voting is that it is really easy to convince people that taking a ballot paper into a booth, marking it, and then depositing the ballot into a locked glass box which is later counted in front of a room of independent observers is a secure way to run elections. It is impossible to convince the average voter that cryptographically secure voting schemes are actually immune from tampering.

Edit: I never understood why we have "election days". Why not have an "election week"?

I’m still amazed the Internet itself works.

Same here. FWIW, it's built on older, slower, less-reliable tech, which forced ridiculous amounts of resiliency into every layer of the design. It's still amazing, but perhaps slightly less so if we look back 40 years. I'm convinced that some parts are running just fine over infrastructure no better than wet string.