I guess it's just bad luck. Or maybe those ports just don't have enough staff?
I've done four cruises since the restart and I've never had trouble boarding. For my first cruise from PC, I took the
DCL bus from the Hayatt and we went right through testing and then boarded. There was no waiting in the lobby, which I think was intentional because of the Covid-19 restrictions at the time. The next two from PC were mostly the same. We didn't take the DCL bus, but we did arrive, went through testing, and then boarded without a wait.
The last cruise was from NYC once all of the Covid-19 restrictions had been removed. Again, we showed up at our arranged boarding time (~11:30) and got right on the ship without a wait.
I don't know why they haven't returned special boarding privileges to Platinum members, though. It seems like an easy enough thing to do.