Why does iphone 12 time-lapse photography have night mode and video does not?

Because the so-called night mode, in fact, is to use continuous shooting multiple synthesis technology to achieve long exposure shooting effect, which is only suitable for still photo shooting. In fact, time-lapse photography takes a photo every certain time, and then connects them to make a video, so it essentially takes a group of static photos continuously, so it can have a night mode.