I like to have multiple boards open at a time (in different Spaces in MacOS) to work on multiple projects at once. The current Miro desktop app for Mac allows for multiple tabs, but not multiple windows. This makes it impossible to create persistent project Spaces. I always have to shuffle the one instance of the Miro app to a different Space.
I know I could just launch Miro in different browser tabs, but being able to just use the desktop app and not fall back on browser windows would be preferable.