Take me for example. I'm working on my own startup. Eventually, I'm probably going to get funding, and sign into some kind of contract. Now the fact is, I'm no legal expert, and I don't have money to hire a legal expert from day one. The fact that the law makes some contracts unenforceable makes me feel much safer about not entering into any kind of mess that will seriously screw me.

Obviously, this only goes so far. And of course I will pay for actual legal counsel before entering a contract. But anything that society can do to make it easier to start a startup, including things like not having to worry about certain legalities, is a Good Thing, since it makes startups more likely.