For some people, the concept of "working" has evolved to "emailing". These professional emailers produce enormous amount of unnecessary email and include the whole world to say that they exist. Their professional existence depends on email.
There is no question that email is a powerful tool for exchanging ideas and answering questions fast. But email is also motionless and leaves a lot of room for interpretation because the tone of conversation is missing.
There is a famous saying in the legal community that says: if you can whisper, don’t talk and if you can talk, don’t email!