That is the message when people talk about analysis. Structural frames for machines are a classic example of this. These are big heavy machines that often benefit from weight. Things have changes though with the cost of materials continuing to inch higher.
SolidWorks was the first system to provide an intuitive sketch based layout approach to structural frames. With SoldiWorks 2007 we take it a step further by now making it easy to analyze these frames using COSMOS beam analysis. The process is automated from the design and yon can easily see where you have gone overboard with material.
For a quick demo check here: