Why doesn't the CC Subscription come with email addresses?

I do not know the reason behind not having email addresses for CC subscriptions. Maybe overhead cost?

If you need email services you can use ZOHO for, I believe, five free email addresses. Of course there are many other services that offer email accounts at reasonable rates.

As Lynda said, the cost would be too high and it would lead to Adobe being in the same space as google and Microsoft with their email services, or at least considered to be. I think keeping it out of Creative Cloud sites works for a number of reasons and rightly so. Increasing cost of CC or creating confusion on the products etc would be negative.