[Animats]

This is something you could A/B test. Some new signups get the old interface, some get the simplified one.

There's a famous failure of this approach. Many years ago, there was a Macintosh graphics application designed by Kai Krause. It started out with a very simple interface. After you'd been using it successfully for a while, a new tool would appear. As the user demonstrated competence to the program, more tools would unlock.

Users hated that. When a rumor started that Krause was going to redo the API for Photoshop, user groups petitioned Adobe to stop him.

[crooked-v]

The big difference in the described case, of course, is that it's the user in control of the on/off toggles rather than it being uncontrollable.

[marcosdumay]

Microsoft Office extensively tried that one too. I have never met anybody that liked their hidden menu items, but it didn't get such an strong reaction as that Apple app.