What This Means
The 600-point tier is still mostly Caribbean and Mexico, but it already includes nine Alaska sailings. That is enough to make Alaska a real consideration, especially for readers who are willing to start in an Interior - GTY cabin. The tier also includes a Hawaii example, which shows the region spread is beginning to widen.
If you want a better Alaska fit, 800 points is the next step. That tier adds Balcony - GTY and has 32 Alaska sailings, including Anthem Of The Seas on a 7n Northbound Alaska & Hubbard Glacier Balcony - GTY cruise fare for 1 guest. By 1,200 points, Alaska becomes more flexible again, with stronger cabin options and more departure choices.
So the practical answer is 600 points for access, 800 points for a more comfortable Alaska search, and 1,200 points if you want the region without giving up too much cabin quality.