Even when they use en espresso machine (because perhaps you ordered an espresso), it makes no difference to the final product if that is automated entirely. A standard espresso machine requires a human only because it cannot automatically reload coffee.
The simple fact is that at this point humans are really only there for the 'experience', not to create the final product.
(I can see you editing your comment out from underneath me by the way.)
Humans in Costa don't add any value to your cup.
They might make you feel better, though, so we'll see if people are fine with being served by a robot (as I already wrote).
But, please keep focusing on the literal.
When pointing at the Moon...
> In most of those chain coffee shops what you get is a coffee vending machine with a human arm to move the cup.
What I'm adding is that anyone with eyes can go to a chain coffee shop and see that they aren't using a vending machine.