I cannont think of a reason why this should be more secure. From what I know this is a thing where federated accounts may be used. They first check your email to determine if they have to redirect you to another site of ask you for a password.
Related blog article from Brad Frost: bradfrost.com/blog/post/dont-get-c... with hundreds of interesting comments on HN: news.ycombinator.com/item?id=19171402
It’s a good point. Also, it’s that article that reminded me of a ticket I had open about this with the security excuse, which in turn prompted this discussion.
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