Core pillars (including WIP things like Scene, UI, Editor, Audio) are in place. Partial or full engine stability (see my "partial stabilization discussion: https://github.com/bevyengine/bevy/discussions/9789). More than a few fully released quality games. More than a few fully released quality non-games / tools (we're already seeing Bevy being used as a foundation for things like CAD software and modeling tools).