You're right, you can go to Moonrise whenever, but I mean you don't get to experience the Shadow Cursed Lands without the shadow in a playable way- you get a cutscene when you move to Act 3, nothing more.
That is good to know. I am just going to just go explore for a while and when I fancy hit moonrise then.
Looking forward to Act 3 though. I like the idea of the city