Why would one use the ChannelFactory to instantiate a WCF proxy rather than a Service Reference?

Question

There seem to be two ways to instantiate WCF service proxies described here. My question is why would one want to use the ChannelFactory to instantiate a WCF proxy and what

Answer 1

One of the specific cases would while developing any office add-in or visual studio add-in projects where you don't have the app.config file.

Also , lets say in an organisation where you want to standardise on certain bindings and certain endpoint security patterns. you would want to create an API which developers can easily use to create a proxy, in this case you would encapsulate all the binding information using channelfactory.