If you are comparing with Mailchimp, there is an important option that is missing in Wix - excluding from segment and/or list, but exists in Mailchimp.
Imagine you want to sent email to 2000 contacts but want to exclude 20 email addresses from that list. In Wix there is no way to do it. You may label the contacts but it is very long process to do so. Still, you need to reduce some large list by excluding addresses for different reasons. In Wix is not possible but in Mailchimp it is possible. In fact, any useful CRM package is having ‘Exclude from segment/list’ functionality. Any plans to do it? I rarely used Wix for sending emails because of this.