What This Means
The cabin mix is entirely Interior - GTY. The region mix is mostly Mexico, with some Caribbean and a single Alaska sailing. That Alaska sailing is the best in the tier: Anthem of the Seas on a 7n Southbound Alaska & Hubbard Glacier Interior - GTY Cruise Fare For 1 Guest $50 from Seward, with a score of 91.
That is a decent headline, but it does not change the overall shape of the tier. The rest of the list is short-haul Mexico inventory out of Los Angeles and San Diego. There is no meaningful cabin spread, no suite access, and very little room to compare options.
The issue is not one bad sailing. It is the lack of depth. At 400 points, the certificate is too thin to support a strong strategy unless you are specifically chasing a low-cost Alaska or Mexico interior option.
By contrast, 600 points already gives you a larger list and a clearer Alaska path. That makes 400 points the weakest tier in practical terms, even though the best sailing is still usable.
Use 400 points only if you are taking the single best available interior play and do not need flexibility. For most readers, the tier is too narrow to anchor a plan.