Thanks for sharing this feedback. You'll be pleased to know that this is already possible. Instructors can send students a report of missing work through the New Analytics tool: How do I view and download reports in New Analytic...
Running a report for missing work is helpful, but the current process is cumbersome. In the grade book when we click on an assignment we have the option of "message students who"... I frequently have two or three students who are missing multiple assignments, it would be more helpful if, in the grade book, I could click on the student name and be given the option "message a list of *** ". From there the options could be "Missing work", "scores lower than", "late work", etc
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