For any design review process to work efficiently, we need attributes of the file (.dwf, for instance) that can be searched and sorted. It is desireable to know the approval status without opening the file (this is more about files that are created and/or exist on my computer)! Secondly, it could save a lot of file re-creation (and allow the re-use of the file to stop round-tripping from the cloud) if the .dwf (and .dwfx) document had the option of whether-or-not to print either Mark-ups, Stamps or both!!!!
Now, I must admit where a "cloud-only" mark-up/review/approval workflow falls apart (as of today)... it's for those of us who'd like to use the .dwf(x) as an "underlay", right under the sheet-to-be-corrected. This use of the marked-up .dwf(x) allows the Autocad/Inventor user to complete and track the tasks as they are done... in their native application! If Autocad/Inventor could open a cloud-based .dwf(x), edit it, then re-publish it... transparently... it would be easier to complete the Design Review process. This is more about the Design Review product than PLM360, but I'd think that Autodesk would like to have one solution, rather than the several vaguely-similar markup/review approaches they currently employ.