Uncle Dave-
I do see (and respect) your point.
However, if Roland have gone this far to allow us to read multifple sound libraries and expand the unit (XV5080) up to 128MB of RAM then why not go the whole hog and give us a full function sampler. It would really give the likes of EMU (E Synthe series), Yamaha (EX series), Korg (Triton series) etc a serious run for their money and if intuitive, people would sample, even to simply add their own loops etc rather than relying on 3rd party sounds.
It really surprises me that the XV5080 can't sample but hey, if I had $5,000 Australian knocking about, I'd still buy one!!!!!!