When I bartended long, long ago I hated making pina coladas and other frozen drinks because we had only one blender and I was responsible for washing all the glassware used in the restaurant and bar as well as cleaning my busy bar. I always said the blender was broken. But, I made a fantastic Long Island Iced Tea and sold that instead. Same money, less mess.
I got a buddy who works at a large eatery. Probably 100 tables. They only have 2 milk shake machines and their worst nightmare is when a table of 4 or 6 come in and each order different flavors. Even if they all ordered vanilla, the machines can’t make 2 servings at a time. And the servers have to make their own, just like they have to pour any other liquids (other than alcohol). They hate to serve the table separately but if they don’t do that, then the first batch of shakes melt before the second ones are ready to go out.