> Sorry, but explain to me how I'm able to submit my taxes securely every year online, or pay for my marketplace insurance securely every month, but voting on our own digital devices is somehow beyond reach of what we can technically fathom?

Because the threat models are completely different.

For starters, if you get your taxes wrong, or if someone fraudulently tries to file on your behalf, it's a reversible process. You can fix it after-the-fact.

Ballots have to be anonymous (secret ballot) and also non-verifiable (to prevent vote-selling). There's no redoing an election later on, or asking a person to confirm their previous vote.