Think cars near the time they were first commercialized, and cars now. Blockchain and smart contract tech is several times more complex than cars, much probably. Of course you will get frustrated if you expect smart contracts to substitute the entirety of the legal system because it's not going to happen, I can assure you. If you look at cars and dismiss them because "they cannot fly" that's on you. There's a lot smart contract tech is doing, can do, and will do. Not only through tech but also through culture. There's plenty of interesting use already, but I'll mention a different example, more on the culture side of things:

People in Brazil are using a new technology to transfer money between bank accounts faster and in an easier manner, it's a hit and growing very fast. It's not blockchain or ethereum, but a. the team involved cites those techs as their main influence, some of them having prior work/interest in those areas aswell and b. they say they have plans for implementing integration with public cryptocurrencies, smartcontracts, and several of their technologies such as smart contracts. Why, you could ask, wasn't this released to the public before, if it's not groundbreaking tech or even a tech innovation at all and provides so much benefit? "Culture".