Faxes are hard to read. Faxes waste bandwidth. Faxes kill trees. All that paper is a waste of natural resources. Score one for the tree huggers.
Fax machines waste ink.
Ink cartridges don't grow on trees either. Fax machines are slow. And with a fax, you still have to wait for a printout. Fax machines waste time. In the time that it takes you to go to a fax machine, retrieve a fax, and then fax or call in a response, you could have answered a dozen emails.