With the amount of restrictions, custom add-ins and specific workflows, it wouldn't matter that much since it's not even inter-office-compatible. Documents that

With the amount of restrictions, custom add-ins and specific workflows, it wouldn't matter that much since it's not even inter-office-compatible. Documents that need to be shared externally are generally converted and exchanged via a portal that does the actual release afterwards. For most documents that don't allow editing and only do form-filling after the fact they seem to prefer PDF over everything else. I suppose the online variants of everything (with PWA support that is) all have the same benefit: easier to stream incremental changes to all users, and easier to centrally manage workflows and access control. Because nothing needs to be re-evaluated locally, you are only left with on-line verification and CAC verification/signatures.