Many fields shouldn't be inherited from the main language, e.g. meta title, meta description or image titles and alt texts. If no translation is entered for these, it would be better if meta description, image titles and alt text would fall back to the product name. And meta description doesn't need a fall back at all.

Inheriting these fields from the main language only leads to problems. In our case, the main language is german. If we sell a product on our english sales channel as well, there's no way we will ever need german meta data for that channel.