From the instructor's perspective, any inactive and concluded students that are still listed in the course do not impact me significantly. The difference for the students is that concluded students can still see the course without being able to submit anything, inactive students do not have even access to view the course.
Either way, they are labeled appropriately, and by default, hidden from the gradebook. If I choose to display concluded students in the gradebook, those students cannot receive additional grades. In the new gradebook, instructors have to REALLY want to find the option. (It requires switching to individual view of the gradebook, turning it on there, and then returning to the main gradebook with it turned on.) For most instructors the student will simply seem to have disappeared. The instructors might still find records of concluded students in analytics, but again, this does not interfere with anything the instructor needs to do. Depending on your reason for wanting to hide this content from instructors, the filters and labels in the course might suffice.
Having access to the records of students whose enrollment changes due to drop/add or financial audits provide a substantial benefit for instruction when students are later re-enrolled in the same course or a similar section. During drop add for example, a student might switch sections expecting to be able to keep their progress. If they were inactivated instead of deleted, I could transfer their progress to the new course with the new section. If you inactivate the students first, and wait until about a week after all drop/add and financial audits are completed, you could still delete those student records that did not need to be reactivated. That delay with access for instructors would be beneficial to our ability to respond to "new" enrollments during that period.
With that said, I believe admins can include deleted students in reports generated from account settings. Instructions are included here:https://community.canvaslms.com/t5/Admin-Guide/How-do-I-view-reports-for-an-account/ta-p/109
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