The Internet is an uncontrollable collection of networks by design; thus we cannot expect one central authentication system to provide any more security than none at all.
OAuth is anticompetitive, as only those companies who have established themselves as brands synonymous with the internet itself will be made generally available as authentication providers. I speak as neither a capitalist, nor a socialist when I state this fact: the internet is anarchic by design!
Besides creating a fourth door, it appears that we must consider ourselves as objects in a database.
Microsoft introduced a gui app with which to manage users and permissions. Is ownership a permission?
In the Unix paradigm, the root user has access to all. Data cannot own data. Cheese cannot cut cheese. Bread cannot bake bread. Microsoft, are you listening?
We really do want the management of users and permissions to be easy peasy. Saving that of owning a faithful IT dog, this is the only way we will feel secure.
Strange times! For we are now at liberty to setup a Samba Domain Controller and manage it with a Microsoft gui app.
But, on the other hand, we feel that Microsoft will have to make money somehow? That is their business, it is true: but we who advocated Samba recognized that Microsoft's magical monopoly was something to be resisted.
Saving the idea of connecting the workgroup to the cloud before understanding it, Microsoft does not need to be resisted any more.