Interesting. Just searched HN and it seems you’re right, it didn’t get much traction with developers, perhaps because it was billed as a facilitation toolkit and not about how to generate or validate better startup ideas, like Design Sprints.
There was a point in time where it seemed like I was seeing it everywhere. At conferences, meetings, university classes, hackathons and any number of presentations, etc.
It’s true that once Google Venture’s Design Sprints book took off, it became a bit of a benchmark in the space of collaborative idea workshops etc.
But before Design Sprints, there was Gamestorming. https://vimeo.com/18880751 It might seem a bit overblown. I’d call it a brand name that happens to reflect a style of work popular before Agile and Scrum made everything cookie-cutter from a backlog.
Forgotten? I've never even heard of it.