We wanted to get the users on the Dashboard, building apps in as fewer clicks as possible while keeping the accounts secure. Google being the most widely used auth and GitHub, the developers' favorite, they have been our first choice.
Your concern makes sense though and we'll be considering it in the next feature rollout.
I think you have the right idea with getting people in as fast as possible.
It is probably safe to say the email login folks don’t mind and maybe appreciate the extra step.
In terms of starting quick as possible with the tool, maybe it’s possible to do shadow profiles where the app starts against a yet unnamed account (tied to a cookie) and when they start using the wizard and playing with it, at some point they have enough to save with a popup with login by id provider or email.
Your concern makes sense though and we'll be considering it in the next feature rollout.