We lived in Hawaii for many years before moving to Texas (ouch!) and are staying with our booking on Solstice in September. Obviously it's no longer possible to dock in Lahaina, and ships going to other parts of Maui will have lengthy and sometimes rough tendering.
The shallow waters around Kauai make it impossible for even mid-sized ships to dock there, and any larger ships cruising along the coastline will remain at a considerable distance from the shore.
Although the Big Island is not my favorite, the volcanic landscape is literally like no other place in the world. Astronauts train there because the terrain is similar to the moon. Kailua-Kona is beautiful, and I understand that some businesses which were destroyed in Lahaina have relocated there. We're just going to enjoy the days at sea and then spend a few days on our "home island" of Oahu. I agree that, if this is your first trip to Hawaii, you would be better off visiting by air...but we're just looking forward to a relaxing voyage.
