As to whether you should close the issue, well, in principle the feature already exists. Now, in its current incarnation it comes with lots of limitations, in particular:

https://hibernate.atlassian.net/browse/HHH-16730

and for sure it would be nice to consider improving @Any, or perhaps somehow merging the idea a bit with regular association mappings, but I’m not sure your issue description really captures any of the work which is really required.