Comment by xnx
People's minds could not comprehend Wave at the time, and I'm still not sure they can now. Even years later articles classify it was a social network (what?), email killer, or chat app.
I saw it as one of the first live collaboration spaces native to the web, not trying to be a paper document, mailed letter, or phone call.
It was a mystery at the time, but in retrospect it seems obvious that it was, at a minimum, a precursor to Slack and Teams. And could have been something else too, it was raw and open ended enough that new usage norms could have emerged and pushed it in any number of directions, setting the tone for any number of possible use cases. It could have been a social network, if the idiosyncrasies of community usage imprinted that on it.
As ever with Google ventures, especially during the DBE era, all they had to do was stick out and let it take on a life of its own. But I think what it takes for growing into an organic identity is more than the average time a developer works on a Google project.