I actually agree with both of you, _as long as it's up to the implementer_. I see requirements specifications that deliberately try to remain vague in the hope

I actually agree with both of you, _as long as it's up to the implementer_. I see requirements specifications that deliberately try to remain vague in the hopes that the developer will produce a "general" abstraction that can be reused - and always end up shooting themselves in the foot by never saying exactly what they want done. Or the "disruptive scrappy startup founders" who want you to build "legos".