Hi Julien! 

I can see how this could be an inconvenience. I apologize for the additional work required to manually indent bullet points on Miro. Unfortunately there is no way to reverse the update. For now, this is how bullet points transfer on to Miro. However, we are always looking for ways to improve our product, and your idea could certainly become a great addition to our product! In order to make sure your ideas reach our product team, would you please so kind to head over to our Online Community and submit your idea to our Wish List?

Here is a handy guide to get you started on how to navigate the Wish List: Wish List: Everything You Need to Know.

Best,