How do you disable this feature? This adds absolutely no value to my or my teams use of Planner.
If I need to attach a document to a card/task, I'll find it or ask the person/team who owns it to resend it. I have never had the frustrating experience of not being able to find a file that we want to attach to an email or share with a colleague... ever. I think this premise is fundamentally flawed and not the result of actual feedback from users. And if you are think "well this could happen with big, enterprise level organisations" then I suggest that the said organisations use the right PMO tools for the job....
There is absolutely no need for the real estate at the bottom of a task to be consumed by inappropriate document suggestions. The icons look like attached files just to make things even more confusing. PLEASE remove this feature or at least allow it to be a selectable option.