There are still a lot of old people that love calling places and havent/won't get the hang of online systems.

Also restaurants of all sorts seem to have no one dedicated to answering the phone any longer. It's really problematic when you are trying to set up larger parties (9 to 12 people for example) at the last minute, which many places can handle but the online system won't do any more than 8 and there is no way to reach them other than messaging that may take a day.