I believe email preference groups and subscription types is a beta, but not have a specific resubscribe email based on preference group is a huge miss. We are managing 6 different brands out of one account and can not use the resubscribe email because it can only be specific to one brand.
There also doesn’t appear to be a way to generate a resubscribe email manually without a form.
As a HubSpot user, we should beable to create a different resubscribe email based on each preference group. And also be able to manually send a contact that email upon request if they want to opt back in.