I agree. However, in Wersi's case, it's price prohibitive, and in the MS's case, it's at the cost of a TOTL arranger section. I happen to think that if your primary need for VSTi's is better quality RH sounds, adding a Musebox or V-Machine to an already great sounding, affordable arranger is still your best bet.
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An arranger is just a tool. What matters is what you build with it..!