Why do most time-travel dramas travel from modern times to ancient times?

I think it is due to the lack of innovative awareness and practice in domestic TV dramas. There are only a few themes in the production of industrialized assembly line production of anti-war dramas, spy war dramas, and urban romance dramas. That routine, but there is no new drama that can be called "imaginative". Therefore, no one wants to make a time-travel drama that is not very stable and can accidentally turn into a drama. So every day, they will just go to the Qing Palace. (Nowadays, domestic time-travel dramas are not only limited to ancient times, but even limited to the Qing Palace , there are too many periods in ancient Chinese history with much more exciting backgrounds than the Qing Dynasty, and time-travel themes would be much more interesting to shoot, such as the Three Kingdoms, but no one filmed it, which shows that no one wants to set a precedent, and they are all following the same old path).