I'm participating on a team where - while they actually own their resources so they can delete it completely, alter the description, etc. at any time they wish - users are not allowed or supposed to upload files themselves, so we can moderate them more effectively by controlling them first for file format, structure, viruses, etc. The issue is as described above - when a moderator wants to post an update for that resource, he has to assign the resource to him for the time being, publish the update and then assign the resource back to the original user.
Also I am pretty convinced that this would just line up more with the possibilities that moderators have all across xenforo. They are pretty much able to edit and control everything and anything if they are given the correct permissions, so not being able to assign them the right to update resources that do not belong to them just feels off - especially when considering that they can easily work around this by just shifting around the resource owner and enable themselves to do pretty much everything with the resource at that point anyway, so why not give them the permission right away.