Why does the sleep time have to be set on both the app and watch?

So, I Was trying to change the sleep times on the watch, I found the setting in the Connect app and changed it (settings -> sleep times). But nothing changed on the watch.

Then I hunted around and buried in the settings are the sleep and wake times. Looks like this puts the watch in sleep mode at the correct times.

Why the redundant settings? Why can't there just be one setting, that can be set from the phone?

Manish