If this sounds like your week
Your external screens hold one brightness while the room's light changes all day.
A laptop panel reads ambient light and adapts; a desktop monitor just sits at whatever you last set. So it's glaring under evening lamplight and washed out at midday, and the only remedy Windows gives you is to interrupt yourself and re-drag the slider every couple of hours.
Where tooling usually breaks
Manual re-levelling is eye strain you schedule yourself.
Stopping to judge the right level for the current light, across several panels, is tedious enough that most people give up and accept a screen that's rarely comfortable. The genuinely adaptive experience has, until now, mostly lived on macOS.