When Tunisia came and we had tunnels, I thought this was a testing ground for tunnels in their up and coming pacific campaign. However only thing we got was trenches/pillboxes.
Japanese are tough to play due to inferior weapons and tanks. I get it. That’s historical. But the Japanese were the masters in defense in the island hoping campaign. They would hide in tunnels and use hit and run tactics to frustrate the hell out of the marines attacking. They would have to be systemically killed 1 by 1, defense line by defense line to control and island.
So….why don’t we have that here? Tunnels are already in the game. In invasion mode, US should have to attack tunnel networks and formidable defense networks to cap points. Japanese as a faction should have the ability to move around a good portion of the map underground away from bomber spam and M13/AA emplacement spam. They should be able to pop up, do damage, then hide back underground. Just like how it was fought.
US players should be forced to fight underground in these tunnel networks to clear them out. It would make for fun gameplay IMO. Right now it’s a fun campaign, but nothing like I thought it would be. It might as well be Moscow or Normandy with palm trees
The faction with all the advantages in automatic weapons? Somehow I don’t think that would help Japan’s situation.
This is true, this would result in masacre.
USA has advantage in vehicles for long range engagments and decimating infantry squads long range and auto weapons advantage, especially BAR acting like STG44 there.
I would suggest giving Japan MG nests and stationary AT guns.
the pacific doesn’t fit the current game play it needs its own game modes
Also,
Tunnels would soon become known to everybody.
And US veterans would often pull a UNO reverse card and use them to ambush Japanese.
So, the more tactical options the better, but they would hardly be game changers.
I was hoping same as you. However, Pacific maps are a real joy to fight in, you have palm trees, water to swim in, beautiful blue sky to die under and none of the horrid landscapes like Stalingrad and Berlin. I sometimes get caught sight seeing 
I think caves, tunnels and fortified concrete bunkers will come with later maps, as we all go Island hopping, I hope 
Don’t forget to bring your Flamethrower!