That being said for the United States, I am in favor of in-person voting requiring proof of citizenship, and making "voting day" a paid national holiday. Not so much for technical or efficiency reasons but for social reasons. I'd argue it should be mandatory but I don't think we should force people to do anything we don't have to force them to do, and I'm not sure we want disinterested people voting anyway.
Exercising democracy, requiring people to put in a minimal amount of thought and effort goes a long way. It should be a celebratory day with cookies and apple pie and free beer for all. Not some cold, AI-riddled, stay in your house and never meet your neighbors, clicking a few buttons to accept the Terms of Democracy process.
I know there's a lot of discussion points around "efficiency" or "cost" or "accessibility" or how difficult it supposedly is to have an ID (which is weird when you look at how other countries run elections) and there are certainly things to discuss there, but by and large I think the continued digitalization and alienation of Americans is a much worse problem that can be addressed with more in-person activities and participation in society. We're losing too many touchpoints with reality.