All OOTB support files should be consolidated into fewer directories and files.
For example, filled regions patterns are stored in multiple files in multiple sub-directories
C:/Program Files/Autodesk/Revit <version>/Data contains two hatch pattern files that do not include all of the OOTB hatch patterns.
C:/Program Files/Autodesk/Revit <version>/ACADInterop contains several additional linetype and hatch patterns.
Nothing within Revit (at least nothing obvious while trying to modify hatch patterns) directs users to these support files. I had to search multiple forums to find the first directory, test the hatch files, fail, search more forums to find the second directory, and test the hatch files until I found the pattern I wanted.
Revit button/Options/File Locations should house the default directories for all user support files including linetypes, hatch patterns, families, etc. It should not take 45 minutes to find how to load and rescale a hatch pattern that is loaded by default.