I don’t know. For example, I see a lot of US citizens complaining that the price of the Apple Vision Pro is ridiculous and unaffordable for what it is, or similar about the Mac memory and storage upgrade pricing. Or even for streaming subscription prices. If you were right, those prices shouldn’t be a big deal.
As for the currency unit, everyone knows what a USD is worth, much less than AUD or CAD or GBP or whatever. The reasons to use USD are the same as for language choice.
You jumped the shark on the Apple pricing argument. People will always complain about prices no matter how rich they are. That is a character trait for many.
I am amenable to your second talking point. I still think my perspective is a useful model to consider. Not "right" in any absolute sense.
Most of the English speaking world runs partly or fully on Metric.
...and there are many Australian YouTubers who talk about prices in US Dollars.
Once you notice this, it is hard to ignore the per capita disposable income argument. The disparity is wild when you run the numbers.