Windows Brightness issue after the 1809 update

I'm not sure if I'm following you. You say you cannot access Advanced Power Options. Why then am I able to succeed on this ASUS Rogue? I'm having zero problems as to getting to the Brightness Options. I go to Windows Settings / Ease of Access / Make everything brighter, move the brightness level to whatever I wish, reboot, shut down, reboot, sneeze five times and the settings saves where I put it. 

I can set it at 100% and it remains there after the rebooting, shutting down, sneezing. I've set it at 60% and it remains there after all the aforementioned. 

Maybe I'm missing something you are saying Adam but I'm having absolutely zero problems with what is pouring out so much grief on yourself.

Yep you are 100% correct.  My ASUS N550JX came with windows 10 1511 build, and when I updated to 1803 there was no issue with screen brightness, now that I have updated to windows 10 1809 build every time I restart the computer the screen brightness is set to 50% even though I always set it to 100%.  And there is no way to access advanced power options in windows 10 1809 build.  I am getting read to file a dispute with the BBB on Microsoft, as they do these stupid new builds that are not correct, then keep coming out with newer builds.  What people do not realize is most manufactures like ASUS, DELL Ext... are only good for 4 windows builds, before the bios is out of date, or the hardware can not support  newer builds anymore, which means it will no longer update, or it will constantly get errors if it does update.  Talk about a monopoly....  Microsoft and manufactures, really do need to be dealt with, as this is really not right  

That is fine everyone at Microsoft are Tree Huggers, but seriously if I wanted to use a dark screen I would not set the screen brightness to 100%.  STOP FORCING PEOPLE TO GO ALONG WITH YOUR IDIOTIC BULL**** MICROSOFT AND LET PEOPLE WHO LEGALLY BOUGHT WINDOWS 10 IN THERE DEVICE, DECIDE WHAT SETTINGS ARE RIGHT FOR THEM....  PERIOD!!

Simply put, I'm surprised because "adjusting brightness" is not a new aspect of Windows 10. I can see it if it were a new addition but my problem is, why is something that has been there, working well removed, accidentally or otherwise. And if it is as you say, Microsoft was being told about this, then I agree, someone isn't listening or they're high on Rhubarb leaves.

"I'm surprised Microsoft would permit "this one" out the door without it being noticed."

Why surprised? 1809 was rolled out with known bugs, Insiders had been & have been advising Microsoft for months prior to the release. Microsoft doesn't listen/Microsoft doesn't care.

😩

So Aaron, do you feel in your own mind, this will be an immediate fix or something dragged out over months. I have to say, I'm surprised Microsoft would permit this one out the door without it being noticed.