Hi, 

The issue #63275 on Odoo's GitHub repository, opened by user fmdl on December 12, 2020, discusses a problem where chatter, attachments, and activities are not consistent across product templates and product variants.

The report suggests that this setting leads to confusion among users, as sometimes a product.template is opened and other times a product.product is accessed. Two solutions were proposed: either to hide the product.template menu and show the product.product menu when group_product_variant is False, or to add an option to unify chatter, attachments, and activities regardless of the group_product_variant setting. 


https://github\.com/odoo/odoo/issues/63275 
Video:
https://github.com/odoo/odoo/issues/63275#issuecomment-959840630

Has anyone found a solution or a workaround for this inconsistent behavior.

A straightforward solution may would be to display the attachments and messages from product.template on the product.product as well, ensuring that the communication and file sharing is consistent across the product and its variants.