I don't disagree there's some cool technology, and in particular in the DeFi space - the problem is it's all fruit of the poison tree at the moment. It's all dependent on price action and the price action is dependent on Tether, on sketchy exchanges, on crime and criminality, on 125X leverage, on manipulation.
And of course, there's so many problems with smart contracts - even the core idea of permanent, irrevocable transactions where bugs can leave you destitute and without anyone to speak to. And no way to unwind them. [1] Unless you're big enough, I guess, and can just fork the chain like Vitalik did with the DAO.