It all comes down to looking at the FMS as though is 'knows all/tells all' but clearly we have not come far enough yet to realise the consequenses of a low fuel state.
PanAmerican, in all their jet aircraft, had a laminated flight conduct chart many times in two pages with detailed data on normal and abnormal flight planning...and yes, flying with the landing gear extended was well presented.
PanAm simply did it better, in my opinion....including a final configuration check as the very last item before brakes release, prior to takeoff.