A lost connection can mean lost time. If your time references rely on a single time source, your system and network synchronization can be seriously compromised when that connection is interrupted or lost.
Time is money.
Operations are at risk. Many complex data processing tasks are dependent upon precise event sequences that are dependent upon each sequence having a correct time tag. Unnecessary bandwidth consumption. Synchronizing campuses over WAN links consumes expensive bandwidth, and can also result in degrading time accuracy. Plug and play.