Also, some companies stopped including the essential data in the email itself, eg. eshops won't list the products or tracking numbers directly in the order conf

Also, some companies stopped including the essential data in the email itself, eg. eshops won't list the products or tracking numbers directly in the order confirmation email, but only link to their website where gmail can't extract it. I think I've seen some airlines do the same, though most do include a boarding pass attachment.