I'm sure that the original sessions were recorded to multi track then mixed.
For my purposes those multitracks could be split to kick, snare, toms & Overheads.
Now I know, from experience, that mixing a multitracked kit is hard work and fraught with all sorts of danger for the unwary but having the option to, at least, EQ the kick and snare would mean that RealDrums would become far more useful.
Seriously, RealDrums is a better program/facility than EZDrtummer and any drum program out there - I've even had excellent drummers comment on the quality and sound of the thing - but if I'm stuck with a clicky kick inside a decent kit for a blues track I'll have to do a hell of a lot of tweaking to correct the one issue and create a bundle more while I'm at it.

Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe