I'll certainly agree that, of all the arranger manufacturers, Korg seem to take the most time to make sure that the loops change a LOT, depending on what chord types you play. Unfortunately, other than the new Guitar Mode, all of that complexity comes from endless variations for each style, that have to be composed and recorded by the style maker.
This makes it quite a herculean task for any user to create styles that match the ROM ones. There is probably ten to twenty times as much information in these 16 bar patterns with multiple chord type variations. And even that pales compared to the i30 days, which, if I remember rightly, also took LH velocity, and RH speed into account when choosing parts to play...
As I've been saying on the '10 years later' thread, what we need is intelligent rules for arranger engines to follow, that generate this kind of complexity from simple source material, so a fairly simple user style can be interpreted automatically, to derive different patterns for a wider choice of chord types and playing styles...
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An arranger is just a tool. What matters is what you build with it..!