A guitar cannot play itself. Drums just sit there silently without a drummer. Basses just don't walk by themselves. But keyboards...? Press play, and off it goes.

We only have ourselves to blame!

Keyboards ARE musical instruments. But they are also music playback devices. How they are treated by the public depends on how much of the former, and how LITTLE of the latter we use them for.

Opinions seem to indicate more of the latter...
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An arranger is just a tool. What matters is what you build with it..!