Comment by epistasis

This is what I think about 95% of startup web pages too.

Somebody told them to advertise the benefits, rather than the what, and it leads unintelligible meaningless ad copy.

Probably, Google didn't want to limit what Wave was and wanted to learn from user usage patterns that people invent. Give people a blank slate and they know to take notes or draw. Give them a blank slate with knobs and drawers and zippers, and they will be wondering "what does this zipper do, why do I need that on a blank slate?"