One size does not fit all.
Of the 10 busiest airports in the world (by aircraft movements), 8 are in the US:
1 ATLANTA GA, US (ATL)
2 CHICAGO IL, US (ORD)
3 DALLAS/FORT WORTH TX, US (DFW)
4 LOS ANGELES CA, US (LAX)
5 BEIJING, CN (PEK)
6 CHARLOTTE NC, US (CLT)
7 DENVER CO, US (DEN)
8 LAS VEGAS NV, US (LAS)
9 HOUSTON TX, US (IAH)
10 LONDON, GB (LHR)
Many US procedures have been / are being adopted by ICAO and vice versa.