It doesn’t take a phd to make a coffee, no matter how fancy the cinnamon/cocoa heart is.
All you're saying here is that you've failed to see the value in customer service, hospitality, speed, accuracy, politeness, etc that go with a retail coffeeshop job. The coffee is the same in pretty much every Starbucks, but the experience can vary wildly depending on how good the baristas are at everything else besides making coffee. Those skills take years to master.
Just sell me the damn coffee and bugger off with "experience". It doesn't require a "skilled" person to politely serve me a coffee. Just make sure the coffee doesn't taste like shit and I'll come back to you unless you spit at me or offend me. Again - no need to be "skilled" to not do that.
The other side takes "unskilled" to be a derogatory term that means the worker isn't a human being with thoughts and wants and needs, and deserving of a wage.
Starbucks hires juniors and trains them to be good baristas. That takes a long time. Just because someone is able to work a coffee machine after a few days doesn't mean they're not skilled eventually. Your argument is like saying 'it only takes a few days for junior devs to be onboarded, so there's no real value in senior devs'.