Comment by kijin

Many distros still provide the `service` command, and don't print any warnings when you use it. At best, you might get an informational message that the equivalent systemd command is being called. There is no recommendation to call the systemd command directly, or any sign of the `service` command being deprecated any time soon. As a result, a lot of people are probably still relying on their muscle memory for the `service` command.