That's an unreasonable ask. I'm not gonna fiddle with the brightness of my monitor throughout the day, thanks

I mean, if you have a modern digital display you might be able to change the brightness through the DDC/CI protocol and a simple app or extension, available in every much every OS. With a keyboard shortcut or two clicks you change it. Fiddle with monitor settings is painful, but that protocol is a godsend. Even one of my cheapest 13 years old monitor supports it.