Use of packages in bigger programs

I’m thinking of converting over a thing I’ve been working on in c++ to odin.
In C++ I have a number of sub-namespaces for different parts of the software. I could create packages in odin for the same purpose but I seem to remember reading somewhere that wasn’t the recommended use of packages and they should only really be used to namespace entire separate libraries that have a separate existance.

I can’t find any reference to that though. Did I image it? What is considered the best practice for packages?