Wave was extremely cool and I wish it had stuck around. Hope it was as fun for you to work on as it was for us to use.

It was fun! Now we still see Wave-iness in other products: Google Docs uses the Operational Transforms (OT) algorithm for collab editing (or at least it did, last I knew), and non-Google products like Notion, Quip, Slack, Loop from Microsoft, all have some overlap.

We struggled with having too many audiences for Wave - were we targeting consumer or enterprise? email or docs replacement? Too much at once.

The APIs were so dang fun though.