The main issue for the B738 is that at normal weights 160kt does not allow a low drag approach as require a gear down/F15 configuration to comply. This isn't economic (requires thrust against that drag level), increases noise under the flight path, increases CO2 emission etc etc.
170 for us works well to keep idle/minimum thrust till 5nm.
All types are different, and that's the poor lottery both the system and ATC try to accommodate. For what it's worth, KK are EXCELLENT in accommodating either speed as long as suitable notice is given to KK INT.
TL, yes aware that 'S' is available. It's also true that very occasionally a dep is missed due to poor speed control compliance reducing the arr gap. The traffic is with TWR at this point rather than DIR, so have executive control. With 55/hr we can't afford any missed rwy time, and that rather than miss say a dep movement because of the above, the offender on speed control is sent around by AIR. I know it doesn't stop a movement loss at that point, but it does get the message across and enforce compliance which in turn will help the rate in the medium term....