Working from the Owner/Owners Rep perspective, the permissions for the PCO area are not as robust as required.
There have been several situations where the Owner of the ACC hub will not be creating their own PCOs and will instead allow the Builder/GC, Architect, etc. access to the PCO tab, or even choose to allow the subcontractor to access. The only permission setting for PCO is Full Control or View all, which would allow each Role to see others PCOs and this is not desired in most situations. The ability to set the permissions to something similar to Issues where they can only see items created by or assigned to their company would be greatly appreciated and make for a more functional change order process.
Currently we are using a workaround where each Company would have a Saved View filtered for their own items, but this is a somewhat fragile system as it does not prevent someone from switching to another view.