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.
case 'mouseenter':
    case 'mouseleave':
      return ContinuousEventPriority;
    case 'message': {
      
      
      
      const schedulerPriority = getCurrentPriorityLevel();
      switch (schedulerPriority) {
        case ImmediateSchedulerPriority:
          return DiscreteEventPriority;
        case UserBlockingSchedulerPriority:
          return ContinuousEventPriority;
        case NormalSchedulerPriority:
        case LowSchedulerPriority:
          
          return DefaultEventPriority;
        case IdleSchedulerPriority:
          return IdleEventPriority;
        default:
          return DefaultEventPriority;
      }
    }
    default:
      return DefaultEventPriority;
  }
}