I. Do. Not. Care. About. The. Tech.
Exactly. The tech doesn't matter. Tech only exists in service of the gameplay, and (introduced with HL1), the story (previous to HL1 the 'story' of most games was just a quick blurb on why there's monsters and why you have to shoot them).
Gamers DGAF about new tech. Gamers wanted to be told a story. We LOVED the story.
Valve could've used the existing engine, built NOTHING AT ALL NEW, and just finished the story with existing assets and we'd all have been over the moon happy.
That right there hits the nail on the head. There is a certain critical mass, an activity level that makes satisfy most discussion needs for most users. It's a tiny fraction of the total traffic of a place like Reddit or Twitter.
But if we have that, and keep the quality level up, we can succeed.
Success to me doesn't mean killing Reddit and Twitter. It means creating a place where smart people can come and find enough content and discussion that they don't need Reddit and Twitter.