I think an internal sequencer is so important on an arranger. Especially since it is the only keyboard I have. It gives me the versatility of being able to have a full song or midi file ready to play with whether on a gig or for practice. I think an internal sequencer is also so important for composition. I like the all in one capability.

If I had a standalone synth workstation and was looking for an arranger then I would not require an internal sequencer on that arranger. Especially if the internal sequencer would increase the price.

Who knows, as people increasingly use computer software sequencers, they may be no need for a sequencer on an arranger. Maybe this would be good so that keyboard manufactures can concentrate on improving on the arranger functions and sounds. And hopefully the prices of some of these “high end” arrangers would be less.