We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
return instance;
  },
  createInstance(type: string, props: Props): Instance {
    const inst = {
      id: instanceCounter++,
      type: type,
      children: [],
      prop: props.prop,
    };
    
    Object.defineProperty(inst, 'id', {value: inst.id, enumerable: false});
    return inst;
  },
  appendInitialChild(
    parentInstance: Instance,
    child: Instance | TextInstance,
  ): void {
    parentInstance.children.push(child);
  },
  finalizeInitialChildren(
    domElement: Instance,
    type: string,
    props: Props,
  ): boolean {
    return false;
  },
  prepareUpdate(
    instance: Instance,
    type: string,