I think there is some confusion going on here. I don´t know any engine which doesn´t use some kind of node based scene graph. This has nothing to do with node based visual scripting systems (which I find more cumbersome and much more limiting than real scripting languages).

Another C4 disadvantage besides the lack of a scripting language is that only one programmer works on it. I don´t see how he will be able to compete with the bigger teams of the competitors like Unity in the future.