I don’t think changing exposure compensation is a good idea. Exposure should be set with other camera settings and never been touched. It would be hard to set other exposure settings and camera settings to still have nice eye adaptation, etc.
Also it would make everthing brighter at night, like sky, clouds, etc. while all you need is more ambiant lighting, aka skylight intensity.
And if, at night, the player goes inside a building with lights, everything will be over exposed while with lumen coming in UE5, skylight is no more an issue with interiors.