We use email, Whatsapp and sms too often when we should have an in-person conversation.
The point is that you cannot contain or manage a strong emotional response unless you communicate in person. You cannot manage incorrect assumptions or interpretations if you send crucial messages electronically.
The other may take as "obvious" something that couldn't have been further from your mind.
So before you click "send" on the email or Whatsapp message, ask yourself "How might the recipient respond? Is there any chance their response might be strong?" Even if you only answer "maybe", reconsider. This might be better delivered in person.
Leadership is exercised one conversation at a time - not via email or sms or WhatsApp. So we miss vital opportunities to exercise leadership and influence the direction of a communication positively when we default to email or text.
This video talks a bit more about this.