I don't see why interactive UI is any less content than anything else delivered over the wire. How would you express a website without it? it almost seems like

I don't see why interactive UI is any less content than anything else delivered over the wire. How would you express a website without it? it almost seems like the word "content" is intended to connote "profitable and dynamically-loaded assets". Why you would not use that phrase is a mystery. I suppose that "dynamically-loadable asset creator" isn't a great marketing pitch from the perspective of artists.