Good lawyers don't write overly complicated contracts, and they don't speak in legalese. The concepts covered within the contract might be complex, but the writing itself is deliberately readable. Complex things are brittle. Clear, well written contracts are more likely to be interpreted correctly by all parties if something unforeseen happens. Contrast this to the alternative - writing a contract by enumerating every possible outcome, hoping that you don't miss one, knowing that if you do, every party will argue for the interpretation that's most favorable to them. The adversarial aspect makes things that much harder.

Contracts in something as flexible as Ethereum strikes me as the ultimate in fragility. There's a great use case for anything that looks like a smallish FSM - formal methods will yield something very usable and provably correct. Being able to do that on a system with a state space the size of Ethereum + The DAO - yea, we're a ways away from that one.