Countdown timer feature: Hide collaborators' activity until timer ends

The single biggest missing feature for me in Miro (and Mural, Stormboard and other competitors) is I often want to facilitate a group activity where we each come up with a unique response to something (like a design challenge / problem / etc) and it’s a problem if we can all see what each other are doing in that moment, because it’s distracting and influences what we do. I see my teammates copying each other, perhaps because our societal culture encourages that so much, even since school. 

I want an option on the timer to make only your own activity visible, until the timer is up - then your teammates’ work becomes visible. Alternatively, ‘private frames’ inside which we can work - toggling on / off the contents from private / public on the board. So when it’s private, the frame looks empty (or has text on it saying ‘contents currently visible only to Luke Flegg’ - that could open up sooo many new use cases.