It's easy to believe, it's hard to realize.

The conflict with Iran is only 'minor' in certain respects, it's a major air campaign otherwise, involving strategic bombing on par with the Iraq War 2 - or at least the initial period.

The US is bombing them from very far away places, the amount of logistical overhead is unthinkable.

These munitions cost a fortune in part because they are purchased in lower quantities, and yes, they have to be able to do a 10x-50x instant ramp up in order to be effective (aka capacity not inventory which is the strategic key).

It takes 2 years minimum to adjust an economy in that way and the US does not have good supply chains.

It's unlikely the US could hope to fight any kind of prolonged conflict with China 'in the area of Chinese territory' for very obvious reasons: they have the supply chains, 1 billion workers, and can turn them on a dime, and don't have 'far to go' to deploy weapons.

The US doesn't even have reliable ways of getting goods and materials into the theatre and has limited quantities of everything.

That said, there are still ways to defend Taiwan and/or to make an invasion futile - but 'broad conflict' ... nope.