I don't like Night Light because the minimum filter level ("less warm") is still too intense for me. Increasing the range of the slider in that direction would fix this.

There's also the need to use a schedule, as opposed to simply enabling/disabling the filter at any time. But I noticed I can get around that limitation by setting the schedule from 20:00 to 19:59 and then using the global toggle.

Something broke here, at least on Fedora 32. Activation and deactivation doesn't happen consistently, as if it has lost track of the time of day. I usually have to move the temperature slider back and forth to get it to kick in.