Nano is the only currency that is capable of hundreds of transactions in a second without fees, and runs in a trustless and decentralized mode (https://nano.org)

For the time being, no one has found vulnerabilities in it.

Not that I know of. From the mainstream ones, Ripple and Stellar come the closest. MaidSAFE has been in development since 2006 and is launching soon.

What can I say, the first generation of any technology is laughably inadequate as a replacement for what came before. That is why for example hardlh anyone uses Bitcoin in everyday transactions and why we still don’t use technology to secure voting, but that will change. As an aside, I don’t think blockchain is the best technology for voting but it’s the buzzword that people understand:

https://www.coindesk.com/in-defense-of-blockchain-voting

Literally nobody thinks Blockchain is good for voting.

It's not good, on the other hand it can easily be better than the monstrous only-working-by-accident software some government contractors can come up with.

Perhaps that’s a bit too overstated?

https://cointelegraph.com/news/russian-blockchain-voting-sys...