It would be nice to be able to preview both a mobile and desktop preview of the event confirmation emails. I tested one out today that looked perfect in the preview, but when I looked at it on my phone(vertically) some things did not line up the way I would have hoped. Now I am having to tweak the confirmation email and register for the event just to see how it looks on a cell phone.
Yes, for any emails, this would be wonderful. The Preview function does not work! It is not an accurate preview at all. Mailchimp has this function and it's really nice.