Expecting legacy styles to play PERFECTLY in a modern arranger is simply unrealistic. But what Roland have done is make the job of tweaking the legacy styles to use the best sounds and drumkits as easy as it possibly can.
That's about all you can ask, nowadays. Unless you WANT an arranger that is SO similar to the legacy arranger that it hardly bears buying...

Or stick with your legacy arranger in the first place.
I doubt in the store you explored the Makeup Tools options, but although tweaking NEEDS to be done, they make it a LOT easier than say tweaking it on an S710 (after you have converted the style in the first place). But the fact is, unless you stick to your old arranger, sooner or later, you will HAVE to tweak or convert your favorite styles. Me, I'd go with whatever brand made this the easiest...
