Hi lyallbs ,
Thanks for your post,
It's done conscientiously. It's due to a limitation in the plugin's first versions and also in order to keep the entities as simple as possible. The supplier ID is in the atum_product_data table, but if we want to show the supplier's name, phone, ... we'll need to add a new subentity, so this will complicate the entity.
That said, I think it's a good idea, so even if it complicates the entity, we'll try to add the Suppliers subentity and some of its fields for the next version.
Best Regards,
José Andrés