Where do all the manufacturers get their sounds from? Well, one thing is certain. They don't get them from sampling another manufacturer's keyboards! They have teams that create the samples themselves. Honestly, James, I didn't answer the question because I thought it was a joke!
The string samples in a Motif were NOT sampled off a Roland. The piano sound in a Ketron was NOT copied from a Korg... The SA2 sax samples in a T3 were NOT copied from a Casio...
In the synth world, there's a fair bit of sampling out of production keyboards for their basic waveforms, but once again, the operative word is 'out of production'. Roland do not sample the factory presets of an M3 for the FantomG.
Or are you claiming they DO...?
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An arranger is just a tool. What matters is what you build with it..!