With in-person voting you can see the voters and see that they are real people. With electronic voting, all you see is records in a blockchain, how can you be sure that they are cast by humans and not an AI-powered script? Or how can you be sure that when you click a button in a voting app, the vote is not changed in the process and your choice not reported to the government? Electronic voting systems are typically closed-source and server infrastructure not available for inspection.

Also one doesn't need to be a programmer to monitor paper voting.

Also, I do not see how blockchain can be used here. Are you suggesting that anyone, including foreign governments, can launch a node and "mine" votes? And whoever has more computing power, has more votes, like in Bitcoin?