Email works for most of us in business because it can handle long messages, it can handle images, and is recognised as 'legally usable'. (Just as faxes were use

Email works for most of us in business because it can handle long messages, it can handle images, and is recognised as 'legally usable'. (Just as faxes were used in an earlier era.) It is widespread, whereas Discord, Zoom, Skype, etc. are not available in lots of businesses. It's no good having Discord if the person you want to communicate with doesn't have it too. It is also good enough and easy enough for non-techo users.