What's the difference between semi-automatic and super-automatic espresso machines?

Semi-automatic machines (like the Breville Barista Express or De'Longhi La Specialista) let you control the grind, dose, tamp, and milk steaming, which gives more flavor control but a steeper learning curve. Super-automatic and one-touch machines (the Breville Barista Touch and Ninja Luxe Café Pro lean this way) automate grinding, dosing, and milk texturing for convenience at the cost of fine-grained control.