Different projects may require the same environments. It would be useful to clone them directly rather than recreating them all over again.
I would much rather see the environments moved out of the project. That way you can set it up once an not have to recreate/clone/import it in each project. That way you would just create or import a project, select the environment in which you would like to run your project, and then run it. Having the environments outside of the project makes more sense to me. It would also be nice to be able to clone an environment to make minor changes, like IP addresses to establish a new environment. Also exporting would be ideal in case you would like to port that over to a test environment that is separated or to archive it for disaster recovery purposes.