You don't have to pay to get all the features of your Ecobee - my Ecobee Suite is free: [RELEASE] Universal Ecobee Suite, Version 1.8.01
It provides access to ALL Ecobee attributes, and comes with a variety of Helper apps that you can use with your Ecobee as well.
As to "why" the native driver doesn't support Fan Only, nobody really knows. Send an email to Hubitat Support with the question, and you may get an answer...
