Flux is still so much nicer than Windows 10's Night Light feature. Flux is gradual and has a transition over a few hours while Night Light has a transition over a few seconds.
Not to mention, with flux you can get the schedule just right. I work night hours, so it’s a light shade of red. But around 1:30 am it gets really, really red. It 1) tells me I should go to bed if I want to be functional when I wake up. 2) I don’t need to be paying attention to the clock and incidentally rush some work.