1) Not all voting needs privacy
2) For stronger privacy, I would look into reading more about;
a) Xpub, Ypub and Zpub and UTXO
b) Mimblewimble
c) Monero and PIVC
-Votes aren't verifiable by everyone.
-Privacy
Just to name a few.
The Duverger's law for example states that there is a strong psychological component, beside the mechanical one
If the vote process is effortless the elector is less involved and that's why going to the ballots is still the favourite way to engage voters
If a system promise to be unbreakable and solve every voting fraud problem, voters will be less careful when voting
Etc. Etc.
Elections are not primarily a technical problem, it's a social rite they are like the rites of passage in ancient tribes