On a little bus it can be difficult to maintain 2500fpm at 270kts under certain conditions, for example if the aircraft is light or the wind is changing quite rapidly.
Slowing to 270 while maintaining 2500fpm is near enough impossible to do effectively even with the brakes out. We don't like using brakes much as it can be considered throwing away energy. If it's subsequently to fly level for miles that's a waste of fuel.
The only reason little busses slow down effectively on final approach is because of the gear + drag flaps. London TMA example: slowing from 180 to 160 once established on the glide can be near enough impossible without lowering the gear or having a helpfully strong headwind. Don't mind so much at 6-8DME but any further out is a bit... noisy.