Mathcad v15 has eBooks as feature. It is very helpful in documenting large analysis. During a large project, analysis have to change to support the design changes. The changes also have to be tracked to show the development of the design. Not including this feature will leave Prime 5.0 as a small analysis tool, several pages. Multi-subject analysis need to have
Table of contents to link the information together
Index to allow for searching
Method to check all the links
Finding missing values or equations that will not solve.
I am hopeful you will see the long term benefit to maintaining this feature.