>>26338931. insignificant size and cost savings over cameras with larger sensors
2. small/dim viewfinders because you can't cheat physics
basically, 4/3 was a several-year-long technology test for m4/3.
but it's a pity that the asymmetrical body shape of E-1/E-3xx didn't catch on and we still have "VF in the middle" layouts even on mirrorless cameras where they make literally zero sense.
