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The electronic viewfinder in the mirrorless system is capable of making up for the light loss in the viewfinder. Under bright lighting conditions outdoors, for example, you wouldn't be able to tell the difference whether the aperture is stopped down or by how much. But if you do a session in a studio, you have to compose and AF under the modeling light only and then, the viewfinder or the monitor will get too dim and grainy. That's when you turn the Live View display to "off" and then the viewfinder would look bright again. Keep in mind that most studio sessions is done using studio flash units and the shooting aperture is fairly small, like f/5.6 to f/8 or something like that.
Composing or more appropriately if I say, focusing at the actual aperture has some advantageous. Some lenses, especially fast lenses, suffer from the so called "focus shift". I am not sure whether you are aware of the issue with Canon EF 50mm f/1.2 or not. You focus on the eye at f/1.2 and you take the picture at f/2 and when you look at the result, the eye is not in focus but the ear is. The focus plane shifts away from what you focus on. A little more dramatic example but you get the drift. That focus shift condition becomes a non-issue using mirrorless.
Two images from Mono Lake, California using Batis 18mm
Sunset at Mono Lake
Framed by tufa formation
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