Meaning of "since changed"
The MVC in Backbone originally stood for Models, Views and Collections, since there were no controllers in the framework. This has since changed.
Does it mean it has changed from that moment or it has changed from that time to the present?
"It has changed from that time, to the time this was written." Which might be present. =)
"It has since changed" could be reworded as "It has changed since then".