Andrew Yang wants to Employ Blockchain in voting. "It’s ridiculous that in 2020 we are still standing in line for hours to vote in antiquated voting booths. It is 100% technically possible to have fraud-proof voting on our mobile phone"

It's not merely technical requirements for digital voting. The booth ensures that no one vote on your behalf, or you vote under influence from someone else.

Still, it'll eventually happen I reckon. And it has advantages as well, possibly increasing voter turnout e.g.

https://www.yang2020.com/policies/modernize-voting/