There's almost always a POS at the entrance of any restaurant, if nothing else for take out orders. If I have to wait more than a few minutes I just walk up and have someone ring me up. Maybe that messes up the order of things, I don't care.

I do this in the US and wonder why others dont. I noticed years ago all restaurants had registers up front anyway so I tried and they took my payment and everywhere else since is pretty much the same story.

Most of the Mexican restaurants I've been to, you order at the counter and then they bring it to you. Just as nice, imo.