Considering IQ3100 has the same technology as the sensor in A7rII, why don't we have silent shutter on IQ3100? We would be able to use shutterless lenses on tech/view cameras, and that would open up quite a lot of new possibilities.
See this article by Jim Kasson describing the silent shutter on the Sony A7S. The electronic first curtain moves quite rapidly, but the electronic equivalent of the second curtain is much slower since the exposure ends when the image data is read out--continuing exposure on the sensor will have no effect on the image. With the A7S this takes 1/30 sec from start to finish. Since the IQ3100 has a higher MP, the readout would take even more time and, depending on the readout speed, an electronic second curtain may not be feasible.Regards,Bill