So why are you buying a mirrorless camera ? because it offers good IQ and performance in a small and light body, I suppose ? Am I wrong ?I fully agree with you that the SLR design is obsolete and all manufacturers need to go mirrorless interchangeable lens camera.
This being said I've played with the existing offering (mostly m43) and the fact is that a good compact w a 5x zoom range (not to mention a 10x zoom range) is still much more convenient and focuses just as fast. And the video is just as good but it has motorized zoom to boot.
So I agree with you on mirrorless but I for one am not, not buying a compact, because of a mirrorless camera.
If I'm right, then : MFT system cameras are lighter and smaller because they are mirrorless : since they don't have the Pentaprism needed for the VF, they are lighter and smaller; since the flange distance between the rear of the lense and the sensor can be much smaller and thus you can make smaller lenses and smaller bodies, so the whole system becomes smaller and lighter.. in the end, MFT cameras are smaller because they are mirrorless. Just think to the FT format : the bodies and lenses had to be bigger to accomodate the mirror and these cameras were not taking the full advantage of the smaller sensor.
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rrr_hhh