American cafes, service, and tipping

I don't understand why cafes, by-and-large, in the U.S. skip one of the most important parts of the experience; servers!

Cafes in Europe and Asia have folks

dedicated

to the cafe tables, whether indoor or out, who take your order, and bus tables. However we don't have this in the U.S. I find it a strange

anomaly

that we seem to have left it out of our culture.