Really? You should see how some of that zone and push gets done when my ETL getsdesperategives in and schedules a cashier or cart attendant to help in GM. It's normally not very pretty. Not that I think Starbucks should back up or anything, but making a latte is like anything else: anyone can do it once they've been taught how. It's not rocket science or more difficult than setting an endcap.
I disagree. Learning to make 'one' drink might be simple, but there's definitely more things to memorize at the starbucks than for working GM IMO.
The major point though is that everyone in the store should know how to zone, whereas there's zero expectation of everyone learning to make drinks at Starbucks.