Then how are you going to make sure that both pilots are in the loop if there are no callouts? I'm not talking about speed callouts - I totally agree with you on that one, but FMS mode and AP/FD changes must be called out. How's the PNF going to monitor the PF if he doesn't know what the PF is doing? Just look at AA's B757 flight into Cali. One is changing AP/FD modes, while the other one is punching on the FMS. I bet you they didn't even write down the clearances. Didn't go too well did it?