As a FOSS fem developer, I disagree with this. Extremely complex tools like Aster, openfoam, calculix, and even now openradioss all exist under open source licenses.

All of these tools are built on state funded research that belonged to the people already, but has been enclosed by capital.

Look at nastran and dyna as the examples of this.

For CAD, Freecad exists and is quite good.

If these volunteer developers had even one hundredth the capital that firms who purchase enterprise CAE tools spend, I bet they would be better than even the things that money currently buys. Look at prepomax, developed by one man to support calculix and its easier to learn how to use than ansys workbench.

Blender is the exception that proves the rule.