ALTDEV ALT UNDERSHOT XING RESTRICTION NOT MET.

Narrative

FLT DTW-LGA: CLE CTR CLRED US FROM 410 TO CROSS ETG AT OR BELOW 370 TO MAINTAIN 330. CAPT LEG TO FLY MY LEG TO PROGRAM FMC. WE WERE W OF ETG ON J-146. WHEN CTR ISSUED CLRNC AND WHILE I PROGRAMMED THE FMC; CAPT WAS LECTURING ON HOW TO REALLY FLY THE ACFT TO SAVE GAS. I REPEATED THE CLRNC TO HIM AND NOTED THE FMC HAD CALCULATED A TOP OF DSCNT POINT. THE CAPT WAS FLYING WITH THE AUTOPLT IN AUTO HOLD AND SPD INTERVENE. THIS IS FINE; HOWEVER; PF MUST REMEMBER TO DSND AT THE APPROPRIATE TIME. THE CAPT WAS SO INVOLVED WITH HIS LECTURE; AND I DISTRACTED BY THIS LECTURE; WE MISSED THE TOP OF DSCNT POINT FAR ENOUGH TO ONLY BE ABLE TO CROSS ETG AT 40000 DSNDING. A 3000 FT ERROR. I ADVISED CLE CTR THAT WE ARE DOING OUR BEST TO MEET THE XING ALT. THERE WAS NO TA. CAPT DID TELL ME THAT HE DOES NOT LIKE THIS AUTOMATIC COCKPIT STUFF. PERHAPS PLTS WHO ARE THAT UNCOMFORTABLE WITH NEW GENERATION ACFT SHOULD STAY WITH STEAM GAUGES; OR TRAIN MORE TO BUILD THE CONFIDENCE IN THE FMC AND AUTOPLT FLT DIRECTOR SYS TO ACT AS A THIRD PLT IN THESE ACFT. AND THE REST OF US CANNOT ALLOW OURSELVES TO BECOME SO DISTRACTED BY CONVERSATION THAT WE MISS XING RESTRICTIONS; HDGS; SPD LIMITS ETC.