Westausatc.
I think you have a valid pont when comparing the F100 with Boeing types or Airbus types on departure with rates of climb & departure speeds etc. It does lag behind.
However I disagree with your assumption that the F100 is a slow aircraft on arrival. Give me unrestricted to Haigh for RWY 21 or Spudo for 24, and the F100 will be happy doing 310KIAS to just before those fixes (about 12 nm).
Most of the time I find it annoying when given a speed restriction of 240 kts or 250 at FL200 or above, and then when further down the line, am asked to give 310 kts for sequencing? How does that work?
Eitherway if in XR's case if they do get A320's, they'll be chopping and changing speeds on descent just the same as the F100 to accomodate the Perth terminal area. Just like their colleges in the 737 or A330 or BAE 146.
Regards.
K- Ex.