I think it boils down to how much you are able to customise your arranger keyboards, in terms of how much you are able edit sounds, etc.

Rewind back to the early days of arrangers keyboards when you had a limited sound and style library, no means of adding new styles or even editing anything for that matter.

So you had to be creative with what resources you had in front of you.

We are really spoiled for choice today having access to 1000s of styles and sounds.