This is true except that the opening back up part only applies to ACP Expert with the Scheduler. Imagine that you are imaging a target in the west and the weather goes unsafe. Then 3 hours later it goes safe again, but the target you were imaging has now gone below the horizon. Picking up where you left off is useless. Instead the Scheduler always looks for the "best" thing to do next or after a weather interrupt, or even at the beginning of the night.