You can read a some of my comments in this thread addressing various concerns. That said, I would still agree. At least for the next 5-10 years (until we have Starlink-level internet and advances in cryptography/UX), electronic voting systems are not feasible.

The nice thing about blockchains is you can avoid DDoS by only allowing people who are "authorized" to "talk to" the blockchain. This can be done by ensuring that "Right to Vote" tokens are only sent to those who would otherwise be participating in the election, and ensuring they can only submit one vote, and one transaction, by sending that token to a specific burn account. This way, with 300 million voters, you would have a cap of 300 million votes. No one else could "submit" a vote, because they wouldn't have permission to on the blockchain network.

This is how blockchains avoid DDoS attacks already, but open and public blockchains have the problem that anyone can buy their native currencies, and with enough money can spam the network. With a "permissioned" system for elections, this risk would be mitigated.

EDIT: I would appreciate if the downvoters engaged with me or explained their reason for downvoting.