75% of your training is at SFO?
What about the rest of the world? In any single month I go to asia, india, us, africa etc
I have 22, 000 hours (8,000 on 777s) and have landed at SFO abour 20 time over the last 15 years but have never practised approaches at SFO in the sim.
I am told many us pilots fly limited routes which makes them extremely familiar , but then perhaps atc expect too much of other, less familiar, operators.
Obviously I'm not excusing incompetence, but visiting an airfield twice a year is not the same as flying in and out daily.