Those extra emails will be discarded at the end just like those too many promotional emails that shops keep sending!
Why do I need more than one email that:
1- Confirms my order with the order details.
2- Provides a link to track my order and to set up delivery notification (including where and when my package will be delivered).
I would expect another email in case:
1- Issue with my order (any issue with the order, or shipping delays, item no longer available...etc)
2- Tracking details were not available at the time of placing the order, so they need to send another email with tracking details.
There are some online shops that send one email only and yes it works!