Washed into my inbox and worth a closer look:

As part of the development of our Custom Usability Index, which can be used to measure the degree of usability of a software project, we as Usability Team took a closer look at those principles and extended them to 13 top categories, which contain multiple usability aspects each. In this article those categories and aspects are explained in more detail and illustrated with examples.

https://blogs.zeiss.com/digital-innovation/en/13-important-usability-principles/

All along with other non-functional requirements to run into, usability, in its various aspects, is something both relevant and ignored just too often, with issues hard to fix afterwards.