If we’re talking about stringed instruments, there are all kinds of different tunings that can be easily applied that open up different scales.
Less “on the fly” tunable instruments exist in order to play music written to use the most preferred scale. And then more music is written using that scale because it can be easily performed. Bit of a vicious circle, which ends up creating a cultural familiarity with a specific scale, as well as unfamiliarity with other scales.
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