I completely agree, however, an awful lot of Korg's success with the style doesn't come from unique OS features... Most arrangers are capable of playing longer styles. Most arrangers are capable of at least three different patterns (subtle or gross, it makes no difference) per style. It's just that the manufacturers rarely make as inventive use of these features as Korg does...
I give a lot of kudos to the Korg style team. They certainly make better use of what their arranger really is capable of than some others...
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An arranger is just a tool. What matters is what you build with it..!