The QF FOQA (flight operations quality assurance) program on the 737 fleet identified a huge amount of unstable approaches and have introduced 210kts @ 5000'!! There Cost Index has nothing to do with it. If it did, then they would be cruising around at 41000' with us. On the descent page in the FMC, we modify the descent speed from eg M078/300kt then 250kt/10000'. Typically, if we get max cruise cancel STAR speed restrictions we modify the above speed to M080/320kts and delete the ATC 250kt restriction below 10000'. QF just use there econ descent which is a right royal pain in the arse to everyone in the airspace.
What a bunch of w@nkers!!!