Attacking the US first, and early, might not be an awful plan; my buddy maphead did exactly as you describe in one of our recent games he first took out the US fleet, then the next turn took Hawaii, then fortified it.
However, the problem is that while Hono is a VC, focusing all your efforts there as Japan invites a mighty 100% defensive buy from the now at-war US. Since Japan has not readied for Calcutta, Sydney, or Siberia, there isn’t a way to achieve the other important strategic goals. Maphead decided to make a play for Sydney via Hawaii, but a stronger player will have fortified ANZAC too much by J4 to make it takeable without 100% japan commit.
As soon as you pivot, America then takes back Hawaii, since they are dedicating everything to it (and so is Japan in the form of defensive planes etc)
Strategies that try to win the game quickly often take gigantic risks. Strategies that win the game slowly trade time for risk.