Likely summarizing and hopefully clarifying advice about Packman…
Do not modify repo priority values, any changes can mess things up and aren’t likely to improve anything.
Add the Packman repo for packages containing apps and codecs that have restrictive licenses because openSUSE policy is very strict not providing packages with those kinds of licenses.
You add the Packman repo with the special “dup --from” command to ensure packages from the Packman repo have priority over packages in other repos, but this is not the same as modifying the repo priority numbers. Why do you want to do this? You want dependencies for an app to come from the same place for better reliability.
Leave the Packman repo enabled to continue to receive updates, this is why you add the Packman with the “dup --from” command.