Don't be surprised.
Apple offers free, basic Mail and Address Book apps and creates paid, more sophisticated solutions, also allowing Developers to provide more sophisticated solutions for sale in the marketplace.
When I need to repeatedly email to multiple contacts, I create a blank draft email, and use the Address Book button to list the appropriate address book group. With the Address Book window open, it's easy to click to add multiple email addresses for a single contact name. Each is added to the message email address list. Then I save that blank email to iCloud Drafts, and it retains the email addreses I've entered. Next time I need to send a message I double-click on it in Drafts to open it, and drag it to one of my other email accounts to add Subject and details, then send from the other account.
Message was edited by: kostby
Another way to manage that list is to create a text clipping of the addresses. Address an email with all the addresses you need, select them all, then drag the whole list to the Desktop (or another location). That will create a text clipping. You can drag that text clipping back into the To field of a new message.
That allows you to keep the addresses out of your Contacts if their only purpose is to contact the team.