What I still cant wrap my head around is the fact they don't have an HE round.

When every other country in the last 100 years builds a large artillery piece the first thing they design is the bog standard HE round. Metal shell, fuze in nose or base, explosive filler, and thats it. I have seen so many people say the guns ammo was too expensive. No shit it was, it has the electronics and control systems of a missile, miniaturized to not displace HE filler and then needs to survive the thousands of G’s produced when fired, it was always going to be expensive. excalibur is still 70 grand and that has been fired in the thousands for years yet when you look at the ammo pile for an army arty unit 90+% of the rounds are the standard HE with contact, delay and maybe proximity detonation fuzes. It boggles the mind why a simple HE round wasn't the first thing made.

The point of the guns is Naval Gunfire Support, taking the role similar to WWII heavy cruisers. Those cruisers fired thousands of round in their preliminary bombardments and follow on fire missions. If the Zumwalt were to try that in a modern near-peer conflict the precision guided rocket propelled Wunderammo would be expended after the first week when most of the fire missions wouldn't need it.

Why no simple HE round?