Hoi,
In OmegaWiki we made the choice that any "defined meaning" can be used as a property. This makes OmegaWiki more like a Wiki than Wikidata were properties have to be created by fiat. What was found is that people tend to not abuse this and there is a limited set that is used as "properties".
When you do not insist on the artificial limits implicit in properties, there will be one victim; it is the structure of the ontology. However when you analyse things, such a structure still exists it is just no longer formal. In a way it is similar to the early insistence on using the "GND types", they did not fit but thankfully we kept the "GND identifier" in this way we left the structure of GND where it belonged; in GND itself. They can map to their hearts content our content using their structure.
One final thought, when we have enough data, we can manipulate it. Because of a lack of data we are still left with many GND types.
PS there is nothing wrong in leaving things as they are.. It works more or less.
Thanks,
Geard