Extra Credits' arguments throughout the series are, in a nutshell, what I believe videogames to be capable of. That's where the statement that videogames can now do "significant" things comes from; they can be art, forcing us to have the uncomfortable dialogues about gender, politics, morality, violence and whatnot that we don't really expect from videogames but we've become quite accustomed to in film.
Sure, the Sims is fun, and it's non-violent. But does it really make you think about anything except for the up-front experience? That's what I mean when I say significance.