Not being a pedant, but where does the 2500 fpm stated actually come from ??
I guess 433's point is that if the figure is not published, then how can you expect pilots to know about it ?? And the figure is most definitely NOT published.
'Expedite' means 'best rate of climb' in the UK. This could be more or indeed less than 2500 fpm for the individual aircraft involved.
'Best rate of climb' is also a wooly term. Best rate in what flight mode .... derated engine use ?? for max economy ?? throttles to the firewall ? in VNAV ? best rate for current speed ? Up to the pilot at the time is all you can safely say.
All open to interpretation, which is a dangerous thing in aviation.