Tested in 4.19, 4.20 Preview, and 4.21 Main.
Lack of the ability to tune-up the Exposure Compensation makes the scene lighting look visually incorrect, especially in fully baked environments like Architectural visualization...
On aside note, but this is relatively the same case: is Crush Highlights (or anything that replaces it) Post Processing setting going to be ever adopted in the LDR mode? This is also important, even if Exposure Compensation going the work the same way as in UE 4.18 and below, without Crush Highlights artifical lights (such as Emissive static) in enclosed environments would produce burned results.
Result: There is no effect
Expected: Adjusting 'Exposure Compensation' will have visible effect just like 'Exposure Bias' did before 4.19. See attached Screenshots
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-61387 in the post.