Does that mean I can’t adjust the preferred temperature at night if it’s currently day time? If so this is a huge regression. If not, the two sentences are badly worded. I already find the current f.lux interface badly designed[0] and this might just make it worse.
[0]: First, its main interface has a slider and a button group below it. That makes no sense because the button group affects what settings the slider display. It really should be a tabbed region enclosing the slider instead. Next, options like “fast transition,” “sleep in on weekends” really shouldn’t be placed in the menu bar. It makes the initial setup a lot more troublesome, and really makes no sense given you already have a window to configure it. And some options aren’t really clearly described in the first place.