@pbx I missed the poll, but I think it's really an "it depends" situation.
When there is a mismatch between the best way to structure your package from a maintenance perspective and the best namespace structure from a user's perspective, you should use imports to expose symbols to the public in the best way regardless of their internal organization.
In packages with a relatively small public interface with a lot of structure or complexity behind it, collapsing the public interface into one namespace makes a lot of sense.