Its very hard to select all outer faces to hide them. I wouldn’t mind an option ‘select all ajoining faces’. in a very simple example, if I had a pipe with many wall faces I could hide the two ends and the select an outer face (there maybe hundreds of outer faces) then select this tool to select all outer faces, furthermore I could use invert selection to then select the inner faces.
This would be very advantageous for complex geometries. I first though of this when I tried selecting all outer faces of an automotive radiator with all its fins… very time consuming. I could have broken the faces up by hiding the inlet and outlet ends and used the process described above.
Just food for thought to try reduce preprocessing times!