I doubt this is a new trend and it doesn't seem very surprising. Being able to communicate "the point" of what you're doing to someone who doesn't know anything about it is a skill that is hard to acquire and hard to maintain for anyone.

It's important for all of us to stress its importance though. Anyone who wants to create something new probably have to constantly polish that skill.

For Fizzygum I did find a good intro video one click from the front page though: http://fizzygum.org/docs/intro/