By that same token, any state progressive enough to think about law-as-code might first put in place measures to limit the length and complexity of contracts written in plain language as well.
The problem here is the length and complexity, not the language used to express the contract. And note that law-as-code would necessarily mean that a layman is fully unable to understand a contract (or the text of a law) at all. They would be fully reliant on a specialized worker to explain the code to them in plain English. Current contracts, if you have the patience to read and map them in full, are fully understandable by anyone with a good knowledge of the English language.
The problem here is the length and complexity, not the language used to express the contract. And note that law-as-code would necessarily mean that a layman is fully unable to understand a contract (or the text of a law) at all. They would be fully reliant on a specialized worker to explain the code to them in plain English. Current contracts, if you have the patience to read and map them in full, are fully understandable by anyone with a good knowledge of the English language.