The feature designed to save time can create a new expectation of constant availability.

Tools that make responding easier quietly make responding expected. Once a message can reach you anywhere in a second, the time it saves is reabsorbed by a new norm in which not replying within the hour looks like neglect, and the net gain disappears. The technology did not decide this. It arrived, and everyone’s assumptions adjusted around it without any discussion.

Decide your own hours rather than inheriting the ones the tool implies, and tell people plainly what they are. Most will adapt without complaint. The expectation was never actually agreed, only assumed.