[notahacker]

Yep. You'd think if the reason the US restarted their war with Iraq was using Euros as a reserve currency, they might have made a bit more fuss about those pesky Europeans creating the Euro with the explicit goal of being a global reserve currency a few years earlier...

[spiralx]

Being the largest reserve currency has more costs to the US than benefits overall and policy has been to try and reduce that exposure for the last decade or so.

https://www.brookings.edu/blog/ben-bernanke/2016/01/07/the-d...

Being a reserve currency means any financial crisis in the world tends to affect your currency and trade, not a good thing.