I hear you Bill . You are completely right in that an arrangement is not necessarily a fully produced piece if work .

But I am extremely confidant that the majority of workstation users , my guess is over 90 percent (based on the keyboard musicians from the numerous fellowships I have worked with over the last 10 years ) never use their workstation for production , they use it for arrangement . They have hundreds or even thousands of incomplete sequences , 8 bar grooves ,musical doodles / sketch pad ideas much like you said you have and I also have..... But the finished article 90 percent of the time is not done on any keyboard . In fact you could describe most of the work done on workstations as arrangements and not fully produced pieces despite the capability to do so .

You can of course go deeper into the production process with a workstation but for most real life examples (not just discussions about technical features or capacity or expandability ) the korg pa arrangers can do most of the functions that most workstation user actually need and use in one unit as a workstation .