"Israel has never fought alongside the US in any war since it's inception."

Except the most recent of course.

That point is kind of a Red Herring. During both Iraq wars Israel was specifically told to not help so as not to inflame the parts of the Arab world who supported our wars on Saddam. Same goes for Afghanistan. Vietnam and Korea were no where in their reach. Israel is not part of NATO so they had nothing to do with Bosnia and were never asked to get involved.

"The greatest thing they can offer the US is expertise in the tech sector. In that regard their highly valuable. They also provide intelligence gathering."

Yes, and a powerful military ally. They, like all our allies, are a power multiplier for the US.

"If everyone’s right that Iran was no threat to the US, why are we fighting this war for Israel."

Trump's starting and handling of this war has been idiotic. No question Iran was an existential threat to Israel, and also a constant threat to the Gulf States, but it was not imminent.