I understand the energy conservation while on battery but I have seen the same with rigs connected to the wall.
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Flashes require a significant amount of power to operate. The subject only needs to be illuminated very briefly, so it would not be necessary to have permanent lighting fixtures. Additionally, the flash is *very* bright and would make it very uncomfortable for the subject if they are looking at the flash.
The main benefit is that the flash is a portable lighting tool in situations where the photographer does not control the environment. For photo shoots in studios, for example, they can set up the lighting so as to not need the flash.
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