Why have manufacturers stopped having proper redundancy on the latest aircraft? Look at the 737, from Jurassic to NG, and the information on the primary flight displays or main panel all comes from completely different sources, be it independent gyros in the Jurrassic's FDs and independent pitot static systems, or with parallel but independent ADIRUs in the NG, with independent sources to each. The standby instruments are also completely independent. Look at the 777 and you have a single ADIRU supplying all main flight instruments, even the standby attitude not being truly independent of the main instruments, fed by the SAARU, which is the back up for the main instruments. How is it that the bigger, dearer and supposedly more advanced aircraft have less redundancy and less indication to pilots of which system is malfunctioning?