Haha! I think we do! As instantly as a website can be created wouldn't fit there! But seriously now, instantly refers to the publishing process and not the account creation one. You just fill out your account details, a few important settings and two-three fields and you create a fully functional website that can receive emails, subscribers and can have multiple pages. Sorry if I mislead you!
I mean to move the requirement for signing up until after they have built with the tool. Take them directly to the builder, and when they want to save their progress - ask them to login.
That would have been a good thought, but when started, we decided to go with the classic approach! Thankfully, this additional friction hasn't had any significant impact to conversions! Anyway, thanks and it's something I'll keep in mind for future versions or projects.