Hi,
It depend on you if you want to join the master image to domain or want to keep it out of domain.
What I observed, whenever we keep master image in domain the domain GPO policies forcefully updated on master images and there might be some policies which can failed your desktop creation and updating next time.
So without joining domain you can create and update desktop pools easily. I have tried lot with joining domain I was always failed to update master image with latest windows patching or any changes on it.
In this case most of times we don't know which policies are rejecting VDI creation or pool updating. Even windows admin will not help us to troubleshoot this.
Better to keep golden image out of domain.
