This is an important feature.
The settings dialog box for these "Layer Attributes" could contain all the various pens, fills and options found in all the tools, that is not just plan settings but section, elevation and show-on-other-story options too.
As in your example, it would be easy to emphasize or de-emphasize elements. And it's a great way to get consistent graphics for certain objects like casework or text.
AC26 INT, M1 Mac, OS 13.2.1
Yes, you read that correctly, we are in the US but use the INT version, because the libraries are better.