The only truths I see about the IGC rules (95% of the world) and the US
rules (5% of the world) a

Guys, we love you to bits but this does look like a bit of a recurring
theme to us in the rest of the world. Maybe the US self belief that the US
knows best is what drives you to success but to many in the wider world it
looks a bit daft.

World IGC Rules - US different
World Metric - US Imperial
In particular for commerical aviation:
World Tonnes - US Pounds
World HPa - US Inches of Mercury

Then there is:
World Colour/Favour/Labour - US Color/Favor/Labor
World Government Transparancy - US Gov Secrecy
World Whistle blower hero - US Traitor
World Left leaning liberalism - US Right wing imperialism, I am joking but
to many it looks just like that, more war war than jaw jaw.

Believe me, there is a big wide world out there, that has many varied
cultures and customs, and that is learning how to work together in many
ways for the common good.

You do not need to stand apart or 'lead' all the time, it would be good if
the US sometimes decided to join in. Go on, you can do it!