Different projects may require the same environments. It would be useful to clone them directly rather than recreating them all over again.
Also, I would add this: when creating a new environment for the same project and using the "Copy endpoints & credentials from project", create a third option to also include existing PROPERTY VALUES. In my projects, I have at least 20 custom properties per project that I have to copy over/fill from existing environments, and it's pretty tedious to copy their values one by one.