One might say that this is covered by a 'system', as in post 2 above, but I was always glad to get a leaving call as it often acted as a prompt to do something else with a flight - such as provide further clearance or a frequency change.
And, if some time has elapsed, there's always the possibility that your earlier clearance is no longer as safe or effective as you'd intended.
Last edited by Liobian; 25th Nov 2021 at 10:21.
Reason: slight addition