Yep, this isn't something unique to
DCL. I sailed on the new Sun Princess back in April, the ship had been delayed a few weeks and my cruise ended up being its 4th. There were still teething issues with the crew, venues and shows. Quite a few things that still weren't open or operating, or weren't operating how they should have been. And this is with a cruise line with many years more experience than DCL, at both operating cruises and integrating new classes of ships into their fleet.
This is DCL's first private destination launch in over 25 years, and only their second ever. If I was on the inaugural I'd be expecting there to be issues.