You display a certain arrogance that the 'US way is the only way'. In fact, I always had to adjust to special strange US rules- 250 below 10 (not needed or desired most other countries), TA 18,000' (totally unnecessary outside Mountain area). The east and west coasts and central should have TAs of 6000' or slightly higher. It's quite easy. Maybe we should all come around to TAs of 10,000' worldwide to wrap it up in that check, but TAs of 18,000'? A nonsense for anywhere that doesn't have mountains up to 15,000'