I would love to never have to leave Miro for any kind of document creation or collaboration.
Ideally, Miro would introduce a fully-featured word processing capability with the full suite of text authoring, formatting, and reviewing capabilities. Additionally, live collaboration like you see in things like Google Docs would be valuable and a fit with Miro’s culture and values. Lastly, being able to easily publish/export to all major formats (Gdocs, DOCX, PDF, etc..) would be very valuable, and possibly the ability to do this continuously via Dropbox, OneDrive, Google Drive, etc...