I wanted to delete a marketplace asset from my project, of which I do know 100% that it has no dependencies outside of the folder it was imported. The editor report references still being in memory, and it kept reporting many reference errors on the deleting process until it eventually crashed. So I took a backup, and deleted the asset folder completely, without the editor running. The project booted up fine and compiled without any visible errors.
Now, is that safe to do? I would prefer not to have this method come back to bite eventually.