It helps parties coordinate in the future. For example, if I need X done by Friday, and I know Y company doesn't work on Fridays, I have a better idea of how m

It helps parties coordinate in the future. For example, if I need X done by Friday, and I know Y company doesn't work on Fridays, I have a better idea of how much workload there is per day. It saves me from sending another email asking "hey, I know you weren't here on Friday, but is that every Friday or a one-time thing? And does that affect Joe from marketing and Sally from DevOps, or is it just you?"