Devices have off switches. People's social expectations don't. For instance, there aren't too many salaried people with enough autonomy to decide that they don't want their bosses e-mailing them after hours, over the weekend, or on vacations and that they're not going to indulge them with prompt replies, regardless of the impact.

Separately, what's with the sarcasm? Do you think that tone makes you more persuasive?