As a cryptography nerd, I think electronic remote voting for national elections is terrifying. Even the best possible technical solutions can be attacked with trivial workarounds if the users' devices can be compromised, or even substituted. Supply chain security for the hardware involved, handling issuing/registering keypairs and handling lost keypairs, etc. Coercion, targeted denial of service, etc.

Even without the actual election system being hacked, the processes around it can still be compromised. State of the art cryptography doesn't help when the keys are stolen and the inputs were replaced.