Hi Nik
Just recently started using the trial of RP3 after becoming thoroughly disillusioned with another photo editing app. So far I’m very impressed and like the integration with Photos although, as another user has mentioned, I’d like the ability to export directly to the Photos Library.
Also, regarding multiple libraries, if I create a separate user with a separate System Photo Library but only have one iCloud account, wouldn’t they all become merged into one library?