It would be nice if emails composed within events were more flexible and used the same email creation program as we use in regular email campaigns. Because I have been creating Constant Contact emails for several years, I was familiar with the old email creation program, but I have to think it is challenging to newer users.
Also, there needs to be a way to easily send event-related emails to a select group of registrants rather than all of them (eg. late registrants who sign up after an email was sent to all who registered on time). I figured out a work-around, but it took hours!