Currently the simple event plugin defines a priority for the event but not all events go through the SimpleEventPlugin. That's just one of several EventPlugins. The remaining ones now get the wrong priority associated with them. 

E.g. I think all of these should be discrete:

change
compositionend
compositionstart
compositionupdate
selectionchange
textinput

These show up too but I don't know if they're even bridged.

dblclick
pointerenter
pointerleave

Flare defines its own priorities.
} from 'react-reconciler/src/ReactFiberLane.new';
import {getCurrentPriorityLevel as getCurrentPriorityLevel_old} from 'react-reconciler/src/SchedulerWithReactIntegration.old';
import {
  getCurrentPriorityLevel as getCurrentPriorityLevel_new,
  IdlePriority as IdleSchedulerPriority,
  ImmediatePriority as ImmediateSchedulerPriority,
  LowPriority as LowSchedulerPriority,
  NormalPriority as NormalSchedulerPriority,
  UserBlockingPriority as UserBlockingSchedulerPriority,
} from 'react-reconciler/src/SchedulerWithReactIntegration.new';
import {
  DiscreteEventPriority,
  ContinuousEventPriority,
  DefaultEventPriority,
  IdleEventPriority,
} from 'react-reconciler/src/ReactEventPriorities';
const InputContinuousLanePriority = enableNewReconciler
  ? InputContinuousLanePriority_new
  : InputContinuousLanePriority_old;
const getCurrentUpdateLanePriority = enableNewReconciler
  ? getCurrentUpdateLanePriority_new
  : getCurrentUpdateLanePriority_old;
const setCurrentUpdateLanePriority = enableNewReconciler
  ? setCurrentUpdateLanePriority_new
  : setCurrentUpdateLanePriority_old;
const getCurrentPriorityLevel = enableNewReconciler
  ? getCurrentPriorityLevel_new
  : getCurrentPriorityLevel_old;
export let _enabled = true;
export function setEnabled(enabled: ?boolean) {