Flying an NG without EFIS installed would be quite tedious, don't you think? Especially for CM2...
Seriously, aren't you referring to the PFD/ND display mode?
Regarding the absence of A/T and VNAV - SW says its cheaper, but is it really? I mean, a computer (this may sound harsh) can set thrust much more precise than a human! (ok maybe not in cruise....)
The whole point of introducing the cost index system was to fly the aircraft as efficient as possible.
Or do you set different cruise speeds for every single flight?
Regards,
Mark