Recently, new versions of Sony P&S cameras (DSC-RX10 II, DSC-RX100 IV) have emerged. They feature new 1" stacked CMOS image sensor called Exmor RS.
I understand that this technology increases the photoreceptor area for a pixel of the same size, thus reducing noise even more. (Previous version Exmor R was already a back-illuminated sensor that already reduced read noise.)
This kind of sensor is a "port" from smartphone camera world with tiny sensor sizes where moving circuity into another layer probably made a significant difference.
In case of 1" sensors of aforementioned (~20 MP) cameras, does it add any significant value over conventionally designed BSI sensors? Are there any other pros, any cons?