problems only have one answer and often one strategy to get to the answer
Totally disagree
You're thinking of equations, which only have one answer. There are often many possible ways to solve and tackle problems.
If you'll permit an analogy, even though there's "only one way" to use a hammer and nail, the overall problem of joining wood can be solved in a variety of ways.
I've never seen these "express code/tests in natural language" ever work well. Your non-coders need lawyer-like skills to wield English very precisely, or it falls to coders that would be better off using code directly.