Your "only 60% foolproof" sounds like a guess. Most digital photographers don't have a 40% failure rate. If they did, they should take up drawing. You have the added advantage of a histogram and blinkies to show when you're clipping shadows and highlights.
Regarding using these cameras (micro 4/3) as a light meter, I use a 24-70mm effective zoom lens to zoom in to the area I want to read the exposure. I don't use a wide-angle lens. I can switch metering from 2-3 degree spot to center average to matrix. If I switched to a lens with a max of 150mm, I could get the spot down to around 1%. I can set the camera to aperture or shutter priority or manual. So there's a lot of flexibility built into the digital camera, more than a dedicated exposure meter. Of course, you may not want that much flexibility and want to use something more simple. That's OK too.
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