It's definitely more then a few seconds (systemd boots fast), but more importantly reasoning about unit files is a lot easier then reasoning about the init-script ordering.
With a unit file I can just declare the conditions under which it should run or stop. If the system doesn't achieve those conditions, then I can solve that problem - rather then having my unit run before the system is ready to do so.
You're not really reasoning about your system because you can say "this runs after this" if you don't also express all the dependencies and failure conditions.
With a unit file I can just declare the conditions under which it should run or stop. If the system doesn't achieve those conditions, then I can solve that problem - rather then having my unit run before the system is ready to do so.
You're not really reasoning about your system because you can say "this runs after this" if you don't also express all the dependencies and failure conditions.