Smart contracts are useless. If you want to pick a particular point out of that article to discuss I'm happy to do so but so far it looks like the same flawed reasoning that has been debunked 1000 times over on this site.
Not going off the article, but if you think that 100% of smart contracts are useless, I would like to know why the uniswap is useless in your mind. Its a decentralized exchange contract for trading tokens on ethereum
but it can be used to trade currencies not offered by centralized exchanges, in a way where you dont have to hand over any funds to risk on a centralized exchange. is useful for me at least
Don't listen to marketing copy from the people trying to peddle you this stuff.