As of now, alerts are set to go to the owner (primary account holder) only. If you'd like to both receive notifications, as a married couple, I suggest simply sharing your credentials and logging in with the same Rachio account.
The Shared Access (Full or Limited) feature is often used by, and primarily intended for, landscapers and full-time irrigation pros. These guys often have over 5 devices, sometimes upwards of 50, shared with them on a single account. Can you imagine getting that many notifications on a daily basis?
Just a bit of background info there. Of course, if you'd like to spark discussion on changing this functionality, Rachio is always receptive to change and we'll track product suggestions from within that forum topic. ( http://community.rachio.com/c/product-suggestions )
Thanks for reaching out!