Hi @hshaw1,
Apologies for the sometimes confusing terminology that the community site here has. I think it's just the terminology available in the platform the community runs on. You can basically treat "solution" as "answer" if that makes a bit more sense to you. Unfortunately, there are many cases where the answer is that Canvas doesn't do exactly what a person is asking for, and this may be one of those cases for you.
I could see where drag and drop in agenda view could be beneficial, but I could also see where it would be problematic without a redesign of the view because only days with items are listed, and users may want to move an item to a day that doesn't exist in the view. My guess is that's one of the reasons drag and drop isn't available there currently. As @cstrikwerda mentioned, this could be submitted as an idea/feature request to Instructure following the steps in the How do I create a new idea in the Instructure Comm... - Instructure Community - 2986 guide.
I hope this info helps a bit, even though I know it's not really what you wanted to hear.
-Chris