Roland, from my perspective at least, seem hell bent on dropping every single feature that is not only unique but useful.
They dropped the CS. They dropped the Dynamic Arranger. They dropped any MIDI Recorder or sequencer. They dropped Mark/Jump for SMF's. They dropped decent aftertouch control. They dropped the Cover Tools. And this is just the tip of the iceberg.
You could build a totally unique TOTL arranger simply on the features they have dropped.
I hate to say it, but Roland's arranger division are morons, one and all...
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An arranger is just a tool. What matters is what you build with it..!