<p>Someone deciding to log in via Google account is assuming (at least among people that I tested) to skip most of registration form and use Gmail email as email, to not fill password.</p>
<p>Even selecting displayed user name may be surprising.</p>
<p>Would it be possible to offer simpler registration form for someone deciding to use a third party provider? For example there is no need to ask about email for someone registering via Google account, there is no need for them to create password (the may still reset password to setup one if it would be required for some purpose).</p>
<p>Discovered to be a major barrier during UX testing of one of OSM editors. My sample size is extremely small but people were extremely surprised to see password, email, username form after deciding to authenticate with Google.</p>
<p>note that on mobile unneeded forms take valuable screen space - see <a href="https://user-images.githubusercontent.com/899988/60381710-6e9c1380-9a59-11e9-98e5-d5a7ee4005dc.png" rel="nofollow">https://user-images.githubusercontent.com/899988/60381710-6e9c1380-9a59-11e9-98e5-d5a7ee4005dc.png</a></p>

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