Here in is the problem.

If some people say that having VSTi's, GIGAsampler and large sample
Libraries on a computer and having the same sounds on a keyboard is comparable, then trying to convince them on the advantages of open keyboards is pointless. That is like saying having an Akai sampler is the same as having an arranger that can play back Akai samplels.

You only have to read Jamesí first post on this topic and Abacus last post to understand.