Guise, Having a workable sequencer, sampler and MP3 on an arranger is not rocket science. Have you ever heard of the Korg PA 1x, PA 800 and PA2x?
Workable Sequencers and samplers have been on keyboards for years. Yes for power power users a computer is preferred but having it workable in the keyboard where it is integrated in to the keyboard gives the performer an even more flexibility.
To say if it has to fix what do you do, What would you say if the arranger is not working do you say I donít have my drummer because the keyboard is in the shop?
Strangely the same people who advocate carrying laptop and other things on a gig along with an arranger are the same ones who say no to an arranger module because it involves carrying more than one thing.