Corporations and wealthy individuals with influence in the writing of this legal system, with massive amounts of financial resources, with negligible moral agency, and with limited criminal liability find very different utility in the ability to use the legal system to roll back contracts, to enforce them, or to ignore them.
Those who find themselves on the other side of this power disparity would often prefer to risk a potentially buggy but inviolate contract than one which they expect to be abused against them.