We evaluated Cocos about 2 years ago and frankly when comparing it to Unity on one side and small and specialized web engines like PixiJS, Three.js, PlayCanvas

We evaluated Cocos about 2 years ago and frankly when comparing it to Unity on one side and small and specialized web engines like PixiJS, Three.js, PlayCanvas or Babylon.js on the other side, it's just not all that great, starting from tooling and ending with the engine architecture.