[Vespasian]

Many (read most) won't have a professional Facebook or Google account.

My boss would not be happy if I had to use a Facebook account on my work machine.

And who evaluates BI tools in their free time?

[instad]

There's also Google login, do you have gmail? Is it OK to log in via a corporate gmail?

[runako]

Outlook is bigger than Google for corporate email. I would suggest adding that (or better yet, listen to the other feedback and allow a standard email login flow).

[instad]

Sure. We will add email registration soon.