Terrible explanation what Oauth is. But the insight at the end of the article is great. UX should always be the driving factor.

I've seen so many integrations use Oauth where it wasn't a good fit or where the spec was not followed. It always results in an abomination and insecure mess.

Maybe it's a know the rules before you can break them thing, but I've found designing custom auth integrations from UX first perspective result in amazing features. It's rare that both parties are willing to put the effort in it though. Usually people try to shoehorn the usecase into an existing oauth platform.

The main selling point of Oauth is to scale auth and authz to thousands of clients and use cases.