Fred, that's the essence of engineering: you know it will work, it will not break because that's the way everybody makes it. But you have to demonstrate it in a nice and presentable way. It needs to be clear and self-explanatory, because you don't know what kind of people will read the document: an inspector, etc. There will be simple idiots among the reviewers, and you better make it clear, and answer all possible questions which can be asked. No matter how silly it sounds, this is why engineers need Mathcad: its primarily a tool for visual communication of simple concepts.
That's why Prime has no value for engineering without controls, scripted objects, and other flashy gimmicks.
Of course, I don't mind having a powerful computer algebra system in the box 🙂
