Suppose I have a scene that I want to change the light brightness level of certain light in the scene.  I update the scene for the brightness level of that light, but then I need to go and change the  controllers in that scene for the light brightness level also.  There used to be something like "update from the scene" that would easily update my controller in that scene, but seems tho have disappeared.  Any other easy way to make "universal adjustment" to the controller from the scene setting?

That is gone in V5.  So apparently that is the version you are using.

If you have a big scene, it may be worth recreating by adding the responders first and setting them to the levels you want.

Then add the controllers and they should adopt the current settings (or so I have read).