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by ptoomey3 2255 days ago
The verified device flow isn’t meant to be as strong as 2FA, but is a very strong mitigation against mass credential stuffing attacks for all users.

In terms of client certs, see my response in https://news.ycombinator.com/item?id=22849985. I agree client certs would be great. However, it can be tricky to couple your app logic with transport based security. A good example of this...chrome/google introduced a crazy cool concept called “channel bound cookies” - http://www.browserauth.net/channel-bound-cookies, but it never gained any traction because of the complexity noted.